Practical care guides, breed profiles, health information and intelligent tools for keeping goldfish healthy for years — not months.https://gold.fish/enhttps://gold.fish/breeds/lionchu/https://gold.fish/breeds/lionchu/Lionchu goldfish care: the lionhead-ranchu cross, how to tell it from either parent, the arched back and large hood, why the name is used loosely, and what it needs.Thu, 01 Oct 2026 00:00:00 GMTbreedshttps://gold.fish/care/goldfish-glossary/https://gold.fish/care/goldfish-glossary/The words goldfish keeping uses, explained once: the body, scales and breeds, water chemistry, filters and kit, health, food and breeding, and the units.Sun, 27 Sep 2026 00:00:00 GMTcarehttps://gold.fish/breeds/tosakin/https://gold.fish/breeds/tosakin/Tosakin goldfish care: the flat tail with its forward-curled edges, the shallow round bowl it is raised in and seen from above, and the still water it needs.Sun, 27 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/care/stress-in-goldfish/https://gold.fish/care/stress-in-goldfish/What stress is in a goldfish, why it opens the door to most of its diseases, the signs that show it, the causes in the order to check them, and how recovery goes.Sat, 26 Sep 2026 00:00:00 GMTcarehttps://gold.fish/health/bubbles-on-fins-and-skin/https://gold.fish/health/bubbles-on-fins-and-skin/Tiny bubbles on a goldfish: harmless air after a water change, or gas bubble disease in the fins, skin and eyes. Telling them apart, and what to do today.Sat, 26 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/losing-weight/https://gold.fish/health/losing-weight/A goldfish getting thinner: how to tell from above, whether it is losing out at feeding or losing weight while eating, and when it points to parasites or TB.Sat, 26 Sep 2026 00:00:00 GMThealthhttps://gold.fish/aquarium/goldfish-in-a-tub-or-patio-pond/https://gold.fish/aquarium/goldfish-in-a-tub-or-patio-pond/How to keep goldfish outdoors in a tub, half-barrel or patio pond: the size that works, shade and air, which fish, and when to put them out and bring them in.Fri, 25 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/care/caring-for-an-old-goldfish/https://gold.fish/care/caring-for-an-old-goldfish/How to look after a goldfish in its last years: what ageing changes and what it never explains, and how feeding, flow, company and the tank should adapt.Fri, 25 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/koi-or-goldfish/https://gold.fish/care/koi-or-goldfish/How to tell a koi from a goldfish in seconds, why colour and fins mislead, what a koi-goldfish hybrid looks like, and when the two can share a pond.Fri, 25 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/what-is-my-goldfish-doing/https://gold.fish/care/what-is-my-goldfish-doing/Swimming sideways, nose down, at the surface, blowing bubbles, eating its own droppings: what each goldfish behaviour means, and which are not normal.Fri, 25 Sep 2026 00:00:00 GMTcarehttps://gold.fish/health/anchor-worm-and-fish-lice/https://gold.fish/health/anchor-worm-and-fish-lice/A thread hanging from a goldfish or a flat disc gliding over it: how to tell anchor worm, fish lice and leeches apart, and why removing them is never enough.Fri, 25 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/mouth-problems/https://gold.fish/health/mouth-problems/A goldfish that cannot close its mouth, has gravel stuck in it, or has pale, raw or worn lips: what each one means, what to do first, and when it needs a vet.Fri, 25 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/vent-problems/https://gold.fish/health/vent-problems/A red or swollen vent on a goldfish, threads hanging from it, or tissue pushed out: what is normal in spring, what is a sore, and when a prolapse needs a vet.Fri, 25 Sep 2026 00:00:00 GMThealthhttps://gold.fish/care/finding-an-uncommon-goldfish/https://gold.fish/care/finding-an-uncommon-goldfish/Sourcing an uncommon goldfish breed: what a specialist is, societies and shows as a route, shipping a live fish, and the breeds you will not find at all.Mon, 21 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/photographing-your-goldfish/https://gold.fish/care/photographing-your-goldfish/Taking the goldfish photographs a vet or an ID needs: the two angles, a clean shot through glass, consistent light, scale in the frame, and the limits.Mon, 21 Sep 2026 00:00:00 GMTcarehttps://gold.fish/aquarium/automating-a-goldfish-tank/https://gold.fish/aquarium/automating-a-goldfish-tank/Timers, top-off, feeders, alarms and controllers on a goldfish tank: which earn their place, which hide what you needed to notice, and in what order.Sun, 20 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/buying-second-hand/https://gold.fish/aquarium/buying-second-hand/What is worth buying used for a goldfish tank, weighing a used filter's mature media against its pathogens, questions for the seller, and disinfection.Sun, 20 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/sumps-and-large-systems/https://gold.fish/aquarium/sumps-and-large-systems/How a sump works, the drain-down sum that decides whether it floods the floor, what it buys a goldfish keeper, and simpler ways to most of the gain.Sun, 20 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/care/a-goldfish-for-a-child/https://gold.fish/care/a-goldfish-for-a-child/A goldfish as a child's first pet: what a child can take on at each age, what the adult must own, fairground and classroom fish, and when interest fades.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/breeding-goldfish/https://gold.fish/care/breeding-goldfish/Breeding goldfish on purpose: choosing the pair, the traditional winter rest and spring warm-up, the spawning tank, eggs, hatching and fry.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/caring-for-a-damaged-goldfish/https://gold.fish/care/caring-for-a-damaged-goldfish/Keeping a blind, buoyant, bent or fin-damaged goldfish well: adapting the tank, feeding a fish that cannot compete, and judging if its life is still good.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-chasing-and-bullying/https://gold.fish/care/goldfish-chasing-and-bullying/Chasing, nudging and torn fins between goldfish: spawning, food, space or a sick fish, how to tell harm from play, and why you move the aggressor.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-genetics/https://gold.fish/care/goldfish-genetics/One species, many breeds: where goldfish colours come from, why a black juvenile may not stay black, what the scale types mean, and what two fancies produce.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-senses/https://gold.fish/care/goldfish-senses/Goldfish see more colours than you in bright light, hear better than most fish, smell, taste and feel pressure down each flank. What it means for the tank.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-wen-care/https://gold.fish/care/goldfish-wen-care/What a goldfish wen is and how it grows, what it costs in sight and breathing, keeping the folds clean, and when overgrowth needs a vet, not scissors.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/injured-goldfish-first-aid/https://gold.fish/care/injured-goldfish-first-aid/First aid for an injured goldfish: why a wound is an osmotic problem as well as an infection risk, the first hour, what makes it worse, and signs of healing.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/rehoming-a-goldfish/https://gold.fish/care/rehoming-a-goldfish/Where a goldfish can go when you cannot keep it: societies, pond owners, shops and rescues, how to vet a new keeper, and why release is never an option.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/showing-goldfish/https://gold.fish/care/showing-goldfish/What a breed standard is, how a goldfish show runs, what a judge weighs, why Japanese ranchu are judged from above, and where standards clash with welfare.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/what-heals-and-what-does-not/https://gold.fish/care/what-heals-and-what-does-not/Fins, scales, slime coat, eyes, colour and spine: which goldfish injuries regrow, which leave a mark, which never resolve, and how long each takes.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/what-kind-of-goldfish-do-i-have/https://gold.fish/care/what-kind-of-goldfish-do-i-have/A step-by-step key to identifying a goldfish from the fish itself, not the tank label, the pairs that are hard to tell apart, and what the answer changes.Sun, 20 Sep 2026 00:00:00 GMTcarehttps://gold.fish/health/fast-or-laboured-breathing/https://gold.fish/health/fast-or-laboured-breathing/Why a goldfish's gills move fast or hard, counting the gill rate, and telling temperature and stress from ammonia, gill flukes and gill disease.Sun, 20 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/grey-film-and-excess-slime/https://gold.fish/health/grey-film-and-excess-slime/A dull grey or milky film on a goldfish: what excess slime is, and telling ammonia burn, skin protozoans, flukes and chemical irritation apart.Sun, 20 Sep 2026 00:00:00 GMThealthhttps://gold.fish/breeds/jikin/https://gold.fish/breeds/jikin/Jikin goldfish care: the X-shaped peacock tail you cannot see in profile, the red-on-white pattern that is finished by hand, and why it is a difficult, short-lived fish.Sun, 20 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/meteor/https://gold.fish/breeds/meteor/The meteor, a tailless goldfish described in 1917: what the one surviving record says, what later writers added, and why no verified fish exists today.Sun, 20 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/pompom/https://gold.fish/breeds/pompom/Pompom goldfish care: the nasal bouquets and how they differ from a wen, the dorsal and dorsal-less forms, feeding around the pompoms, tank and tankmates.Sun, 20 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/tamasaba/https://gold.fish/breeds/tamasaba/Tamasaba goldfish care: a deep ryukin-like body on a single, undivided tail, how it came from Niigata's koi farms, why it is reported hardy outdoors, and what it needs.Sun, 20 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/veiltail/https://gold.fish/breeds/veiltail/Veiltail goldfish care: the unforked hanging tail and tall dorsal, why the finnage is the care problem, water quality, tank, feeding and tankmates.Sun, 20 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/wakin/https://gold.fish/breeds/wakin/Wakin goldfish care: a double tail on a single-tail body, why the care follows the body rather than the fin, ponds, size, feeding and tankmates.Sun, 20 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/best/heaters-for-goldfish/https://gold.fish/best/heaters-for-goldfish/Researched picks for goldfish heaters, and the catch in the category: most will not set below 20 °C, which is above where a goldfish's floor belongs.Sun, 20 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/best/pond-pumps/https://gold.fish/best/pond-pumps/Researched picks for goldfish pond pumps, judged on the two figures that matter: the size of solid a pump passes, and the flow left after the lift.Sun, 20 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/best/siphons-and-gravel-vacuums/https://gold.fish/best/siphons-and-gravel-vacuums/Researched picks for goldfish water changes: why bore beats length, what changes over sand or a bare bottom, and when a tap-fed system pays.Sun, 20 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/best/uv-clarifiers/https://gold.fish/best/uv-clarifiers/Researched picks for pond UV: clarifiers and sterilisers differ mainly in dose, and some headline volume ratings assume a pond with no fish.Sun, 20 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/aquarium/a-pond-through-the-year/https://gold.fish/aquarium/a-pond-through-the-year/A goldfish pond month by month: the spring restart, spawning, summer's oxygen problem, the autumn work that decides winter, and blanketweed.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/algae-in-a-goldfish-tank/https://gold.fish/aquarium/algae-in-a-goldfish-tank/Which algae you have, why goldfish tanks grow more of it than most, what reduces it, and why green water is a special case with its own fix.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/aquascaping-for-goldfish/https://gold.fish/aquarium/aquascaping-for-goldfish/Why most aquascaping advice fails goldfish, the five constraints that replace it, which plants survive, and three layouts you can still siphon.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/building-a-goldfish-pond/https://gold.fish/aquarium/building-a-goldfish-pond/Where to put a goldfish pond, how deep to dig, choosing and sizing the liner, the levelling mistake that shows forever, filtration, plumbing and safety.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/cloudy-water/https://gold.fish/aquarium/cloudy-water/Bacterial bloom, green water, tannins, dust or something dead: how to tell cloudy water apart, why a new tank's bloom usually clears, and what prolongs it.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/filter-media/https://gold.fish/aquarium/filter-media/Mechanical, biological and chemical filter media for goldfish: the order of flow, why carbon is optional, and why disposable cartridges undo the cycle.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/heaters-and-cooling/https://gold.fish/aquarium/heaters-and-cooling/Why a goldfish heater is a floor, not a furnace: sizing and fitting one, the two ways heaters fail and which is dangerous, and cooling a tank in summer.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/hospital-tank/https://gold.fish/aquarium/hospital-tank/What a hospital tank is for, how it differs from quarantine, how big it must be, running one with no cycle, and the spare sponge that makes it quick.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/ph-kh-and-gh/https://gold.fish/aquarium/ph-kh-and-gh/What pH, KH and GH measure in a goldfish tank, why a steadily falling pH is the warning to watch, how KH prevents a crash, and why pH decides how toxic ammonia is.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/power-cuts-and-emergencies/https://gold.fish/aquarium/power-cuts-and-emergencies/What goes wrong in an aquarium power cut, why a canister that has been off for hours needs opening first, keeping oxygen going, and one item to own.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/snails-hitchhikers-and-biofilm/https://gold.fish/aquarium/snails-hitchhikers-and-biofilm/Brown dust on the glass, white slime on new wood, snails nobody bought, worms in the gravel: what each is, which matter, and what they may say about feeding.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/tank-placement-and-floor-loading/https://gold.fish/aquarium/tank-placement-and-floor-loading/What a goldfish tank weighs, why the stand matters more than the furniture it replaced, how joists decide where it goes, and where it never should.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/tap-water-and-source-water/https://gold.fish/aquarium/tap-water-and-source-water/What comes out of your tap, how chloramine changed the rules, the softener that ruins an aquarium, nitrate in the supply, and well water, RO or rain.Sat, 19 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/care/aquarium-salt-for-goldfish/https://gold.fish/care/aquarium-salt-for-goldfish/What aquarium salt does for goldfish, the three jobs it is good for, why concentration matters more than spoonfuls, and why it is never a tonic.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/choosing-and-bringing-home-a-goldfish/https://gold.fish/care/choosing-and-bringing-home-a-goldfish/Choosing a goldfish: reading the shop's whole system, what to refuse in a fish, the bag and the journey home, and acclimating without adding the bag water.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/finding-an-aquatic-vet/https://gold.fish/care/finding-an-aquatic-vet/Fish vets exist and can do what no keeper can. How to find one, when it is worth it, what to bring, moving the fish, and what to do if nobody is near.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-anatomy-and-biology/https://gold.fish/care/goldfish-anatomy-and-biology/How a goldfish works: gills, slime coat, scales and colour, osmoregulation, a swim bladder tied to the gut, no stomach, and what breeding changed.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-behaviour-and-intelligence/https://gold.fish/care/goldfish-behaviour-and-intelligence/What goldfish remember, what they can learn, how they find their way about, their daily rhythms, and what the three-second myth costs the fish.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-diseases-explained/https://gold.fish/care/goldfish-diseases-explained/The organisms and conditions behind goldfish illness, from ich, flukes and fin rot to columnaris, dropsy, swim bladder disorder and the herpesviruses.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-tankmates/https://gold.fish/care/goldfish-tankmates/Which tankmates work with goldfish, which are popular mistakes, and the four questions that decide every case: temperature, mouth size, speed and flow.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-welfare/https://gold.fish/care/goldfish-welfare/What separates a goldfish that survives from one that thrives, a working way to judge it, the welfare problems particular to goldfish, and what matters most.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/handling-netting-and-moving-a-goldfish/https://gold.fish/care/handling-netting-and-moving-a-goldfish/Catching a goldfish without harm, why a container beats a net, the fish that will not be caught, safe transport, and moving a whole tank to a new home.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/humane-euthanasia/https://gold.fish/care/humane-euthanasia/When putting a goldfish to sleep is right and when not yet, why a vet is best, the accepted method without one, and why flushing or freezing is worse.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/is-my-goldfish-breeding/https://gold.fish/care/is-my-goldfish-breeding/Recognising goldfish spawning: the chasing, white pimples on the gill covers, a swollen female, eggs; what it is mistaken for, and what to do next.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/leaving-goldfish-while-away/https://gold.fish/care/leaving-goldfish-while-away/How long goldfish can be left alone, why going unfed is an emergency limit and not a holiday plan, which feeders work, which blocks to avoid, and a sitter's notes.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/quarantining-a-new-goldfish/https://gold.fish/care/quarantining-a-new-goldfish/What a quarantine tank needs, setting it up before the fish arrives, what to watch for over at least four weeks, and what to do with only one tank.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/sexing-goldfish/https://gold.fish/care/sexing-goldfish/Why most goldfish cannot be sexed, the three signs that work only in breeding condition, the body-shape myths, and whether it matters at all.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/signs-of-a-healthy-goldfish/https://gold.fish/care/signs-of-a-healthy-goldfish/A two-minute check of posture, fins, breathing, colour, eyes and appetite, what looks alarming but is normal, and keeping a baseline to compare against.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/the-domesticated-goldfish/https://gold.fish/care/the-domesticated-goldfish/Where goldfish came from: a drab East Asian carp, a rare colour mutation, temple ponds, and a thousand years of selection behind every breed.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/using-medications-safely/https://gold.fish/care/using-medications-safely/Medicating a goldfish without making it worse: your real water volume, what to take out of the filter, aeration, each class of drug, and what does nothing.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/what-keeping-goldfish-costs/https://gold.fish/care/what-keeping-goldfish-costs/The shape of what goldfish cost: why the fish is under one percent of it, what the setup is made of, working out your power and water, and the surprises.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/why-did-my-goldfish-die/https://gold.fish/care/why-did-my-goldfish-die/What to do in the first hour if other fish share the tank, reading the water for what happened, the common causes, and what to change before the next fish.Sat, 19 Sep 2026 00:00:00 GMTcarehttps://gold.fish/food/fasting-and-rest-days/https://gold.fish/food/fasting-and-rest-days/Why keepers fast a floating or sinking goldfish for two or three days, how long a goldfish can go without food, when fasting is wrong, and how to break a fast.Sat, 19 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/feeding-a-sick-goldfish/https://gold.fish/food/feeding-a-sick-goldfish/What to feed a goldfish that is unwell, getting a reluctant fish to eat, how medicated food works and why it needs appetite, and how long it can go without.Sat, 19 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/feeding-fry-and-young-goldfish/https://gold.fish/food/feeding-fry-and-young-goldfish/When to start feeding goldfish fry, why the first food is smaller than anything sold in a tub, hatching brine shrimp, how often, and why the water matters more.Sat, 19 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/feeding-through-the-seasons/https://gold.fish/food/feeding-through-the-seasons/Why digestion slows in cold water, what to feed a goldfish at each temperature, why autumn matters, and why a warm day in January is no cue to feed.Sat, 19 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/goldfish-nutrition/https://gold.fish/food/goldfish-nutrition/What goldfish need from food: protein and why more is not better, fat and rancidity, carbohydrate, fibre, vitamins, and how needs change with temperature.Sat, 19 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/homemade-goldfish-food/https://gold.fish/food/homemade-goldfish-food/A gel food recipe for goldfish with proportions, why agar beats gelatin, why a little ground pellet helps balance it, what to leave out, and storing it safely.Sat, 19 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/reading-a-fish-food-label/https://gold.fish/food/reading-a-fish-food-label/What protein, fat, fibre and ash percentages mean, why foods compare only on a dry-matter basis, how vague ingredient lists may be, and a quick shop check.Sat, 19 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/health/bent-spine/https://gold.fish/health/bent-spine/Why a goldfish's spine curves, why it usually happened long ago, the vitamin deficiency behind it, when it points to mycobacteriosis, and living with it.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/black-patches/https://gold.fish/health/black-patches/Why black marks appear on a goldfish: skin darkening over an old injury, a young fish's colour settling, or black spot, and how to tell a mark from a growth.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/constipation-and-stringy-faeces/https://gold.fish/health/constipation-and-stringy-faeces/What goldfish faeces should look like, what long, pale strings mean, why round fancies get constipated, and when stringy faeces mean parasites, not diet.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/flashing-and-rubbing/https://gold.fish/health/flashing-and-rubbing/Why a goldfish darts and rubs against gravel, rock or glass, telling parasite irritation from water chemistry, and what to check before treating anything.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/fungus-and-cotton-growth/https://gold.fish/health/fungus-and-cotton-growth/Cotton-like tufts on a goldfish: telling true fungus from columnaris and breeding tubercles, why fungus is nearly always secondary, and what to do first.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/lumps-growths-and-tumours/https://gold.fish/health/lumps-growths-and-tumours/A waxy seasonal growth, often called carp pox, versus anchor worm, a cyst or a tumour on a goldfish: why growth rate matters, and which lumps need a vet.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/missing-scales/https://gold.fish/health/missing-scales/Why a lost scale is a skin wound, how to tell missing scales from the raised scales of dropsy, what the place tells you about the cause, and regrowth.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/pale-or-faded-colour/https://gold.fish/health/pale-or-faded-colour/Why goldfish fade: genetics, diet or a bare white tank; why paling in an hour differs from fading over a year, and what will bring the colour back.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/popeye-and-bulging-eyes/https://gold.fish/health/popeye-and-bulging-eyes/Why a goldfish's eye bulges, why one eye and two mean different things, which breeds bulge normally, and the lesser-known cause that comes from the tap.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/ulcers-and-sores/https://gold.fish/health/ulcers-and-sores/What an ulcer on a goldfish looks like, how it differs from an injury or a growth, why it is more urgent than it looks, and what to do before treating.Sat, 19 Sep 2026 00:00:00 GMThealthhttps://gold.fish/best/air-pumps/https://gold.fish/best/air-pumps/Researched picks for goldfish air pumps: quiet diaphragm pumps for sponge filters and air stones, from small interim tanks to deep tanks and stock tanks.Thu, 03 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/best/aquarium-test-kits/https://gold.fish/best/aquarium-test-kits/Researched picks for testing goldfish water: liquid master kits, strips, hardness tests and an in-tank ammonia sensor compared on accuracy and ease.Thu, 03 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/best/filters-for-goldfish/https://gold.fish/best/filters-for-goldfish/Researched picks for goldfish filtration: canisters, hang-on-backs and sponge filters compared on turnover, media capacity and gentle flow for fancies.Thu, 03 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/best/goldfish-food/https://gold.fish/best/goldfish-food/Researched picks for goldfish food: sinking pellets, gel food and insect-based granules compared on format, ingredients and suitability for fancy goldfish.Thu, 03 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/best/tanks-for-goldfish/https://gold.fish/best/tanks-for-goldfish/Researched picks for goldfish tanks: a 40 breeder, a 75 gallon, a 20 long, a 100 gallon stock tank and a European kit, compared on footprint and volume.Thu, 03 Sep 2026 00:00:00 GMTbuying guideshttps://gold.fish/aquarium/aeration-and-oxygen/https://gold.fish/aquarium/aeration-and-oxygen/How oxygen gets into aquarium water, why a goldfish tank can run short of it, what an air pump really does, and the signs that a tank is running low.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/aquarium-decorations/https://gold.fish/aquarium/aquarium-decorations/Choosing goldfish-safe decor: smooth surfaces for delicate eyes and fins, no holes that trap a fish, inert rocks, driftwood and ceramics, and what to avoid.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/aquarium-lighting/https://gold.fish/aquarium/aquarium-lighting/How much light goldfish actually need, why a timer matters more than brightness, choosing a basic LED, and keeping light from turning into algae.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/choosing-a-goldfish-tank/https://gold.fish/aquarium/choosing-a-goldfish-tank/How to choose a goldfish tank: why footprint beats height, glass versus acrylic, standard sizes in litres and gallons, second-hand checks and placement.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/cleaning-a-goldfish-tank/https://gold.fish/aquarium/cleaning-a-goldfish-tank/What to clean in a goldfish tank and what to leave alone: gravel vacuuming, algae, decor, filter media rinsed in tank water, and why soap is never used.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/goldfish-filtration/https://gold.fish/aquarium/goldfish-filtration/Mechanical, biological and chemical filtration, which filter types suit goldfish, how to think about turnover and media volume, and how to soften the flow.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/goldfish-ponds/https://gold.fish/aquarium/goldfish-ponds/Why single-tailed goldfish thrive in ponds, how deep to dig, filtration and UV clarifiers, plants, predators, stocking, and bringing fish through winter.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/how-to-do-a-water-change/https://gold.fish/aquarium/how-to-do-a-water-change/A step-by-step goldfish water change: equipment, matching temperature, treating chlorine and chloramine, how much to remove, and hose systems for big tanks.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/plants-for-goldfish-tanks/https://gold.fish/aquarium/plants-for-goldfish-tanks/Which aquarium plants survive goldfish, which become food, how to attach and weight them, pothos with roots in the water, lighting, quarantine and snails.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/substrate-for-goldfish/https://gold.fish/aquarium/substrate-for-goldfish/Goldfish sift the floor of their tank all day. Why keepers avoid small gravel, why sand and bare bottoms are the usual choices, and how to clean them.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/testing-goldfish-water/https://gold.fish/aquarium/testing-goldfish-water/Which water tests matter for goldfish, liquid kits versus strips, how often to test, and target ranges for ammonia, nitrite, nitrate, pH and KH.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/aquarium/the-ideal-goldfish-aquarium/https://gold.fish/aquarium/the-ideal-goldfish-aquarium/An editorial tour of an ideal goldfish aquarium, from footprint and filtration to substrate, plants and light, and what it looks like after six months.Wed, 02 Sep 2026 00:00:00 GMTaquariumhttps://gold.fish/food/frozen-food-for-goldfish/https://gold.fish/food/frozen-food-for-goldfish/Which frozen foods suit goldfish, how to thaw and drain them, how often to feed them, and why bloodworms deserve more caution than their popularity suggests.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/gel-food-for-goldfish/https://gold.fish/food/gel-food-for-goldfish/What gel food is, why fancy goldfish often do well on it, how to mix, store and serve it, and whether the extra effort is worth it for your fish.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/goldfish-flakes/https://gold.fish/food/goldfish-flakes/Flakes are the food most goldfish are given first. When they are perfectly adequate, when a pellet does better, and how to feed flakes without the drawbacks.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/goldfish-pellets/https://gold.fish/food/goldfish-pellets/How to choose a goldfish pellet worth feeding every day: sinking or floating, pellet size, what the label should say, storage, and how much to give.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/goldfish-treats/https://gold.fish/food/goldfish-treats/Which extras a goldfish can safely have now and then, how often to offer them, the household foods that cause trouble, and how to hand-feed without stress.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/live-food-for-goldfish/https://gold.fish/food/live-food-for-goldfish/Daphnia, brine shrimp, blackworms and mosquito larvae as live goldfish food: what each offers, where the risks lie, and why feeder fish are best avoided.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/overfeeding-goldfish/https://gold.fish/food/overfeeding-goldfish/Why goldfish always look hungry, what too much food does to the fish and the water, how to spot it, and a simple routine that resets feeding for good.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/sinking-vs-floating-food/https://gold.fish/food/sinking-vs-floating-food/Why keepers feed fancy goldfish sinking food, when floating food is fine, how to sink what you have, and how to make sure every fish eats.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/food/vegetables-for-goldfish/https://gold.fish/food/vegetables-for-goldfish/Which vegetables goldfish can eat, how to blanch and weight them, how long to leave them in, and what to keep out of the tank, with a preparation table.Wed, 02 Sep 2026 00:00:00 GMTfoodhttps://gold.fish/care/can-goldfish-live-in-a-bowl/https://gold.fish/care/can-goldfish-live-in-a-bowl/Why bowls make goldfish care so hard, what actually goes wrong in them, and the simplest upgrade path if you already have a goldfish in a bowl.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/cycling-a-goldfish-aquarium/https://gold.fish/care/cycling-a-goldfish-aquarium/How the nitrogen cycle works in a goldfish tank, how to cycle with or without fish, seeding a filter, knowing when it is done and the mistakes that undo it.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/do-goldfish-need-a-filter/https://gold.fish/care/do-goldfish-need-a-filter/Why every goldfish tank needs a filter, which filter types suit goldfish, how much flow to aim for, and how to clean media without killing its bacteria.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-care-guide/https://gold.fish/care/goldfish-care-guide/What goldfish really need to live a long, healthy life: tank size, filtration, the nitrogen cycle, feeding, a maintenance routine and early signs of trouble.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-for-beginners/https://gold.fish/care/goldfish-for-beginners/A plain-spoken introduction to keeping goldfish well: which fish to choose, what to buy, the first week, the three water numbers and the mistakes to skip.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-tank-setup/https://gold.fish/care/goldfish-tank-setup/Everything needed to set up a goldfish aquarium: the equipment list, placement, the first fill, cycling before fish, adding fish slowly and the first month.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-tank-size/https://gold.fish/care/goldfish-tank-size/How much water goldfish really need, why footprint matters more than height, what the common tank sizes suit, and when a pond is the better answer.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/goldfish-water-temperature/https://gold.fish/care/goldfish-water-temperature/The usual temperature range for fancy and single-tailed goldfish, what changes as the water warms, whether you need a heater, and why big swings matter.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/how-big-do-goldfish-get/https://gold.fish/care/how-big-do-goldfish-get/Adult sizes for single-tailed and fancy goldfish, how fast they grow, what limits growth, why a stunted fish is not an adapted one, and typical size by breed.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/how-long-do-goldfish-live/https://gold.fish/care/how-long-do-goldfish-live/Realistic goldfish lifespans by type, why so many die in their first year, the stages of a goldfish's life and what the longest-lived fish have in common.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/how-many-goldfish-can-i-keep/https://gold.fish/care/how-many-goldfish-can-i-keep/Worked stocking examples for 60, 100, 150, 200 and 280 litre tanks, why bioload matters more than fish length, and how filtration and water changes fit in.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/how-often-to-change-goldfish-water/https://gold.fish/care/how-often-to-change-goldfish-water/How much goldfish water to change and how often, how to set the schedule from nitrate readings and stocking, and why small weekly changes beat rare big ones.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/care/how-often-to-feed-goldfish/https://gold.fish/care/how-often-to-feed-goldfish/How often and how much to feed goldfish, why small meals suit a fish with no true stomach, how temperature changes the rule, and a sample weekly routine.Tue, 01 Sep 2026 00:00:00 GMTcarehttps://gold.fish/health/clamped-fins/https://gold.fish/health/clamped-fins/What it means when a goldfish holds its fins clamped against its body, the water, parasite and stress causes behind it, and what to check and do first.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/cloudy-eyes/https://gold.fish/health/cloudy-eyes/Why a goldfish's eyes turn cloudy, from poor water and injury to bacterial infection and cataracts, why one eye or both matters, and what to check first.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/floating-upside-down/https://gold.fish/health/floating-upside-down/Why a goldfish floats upside down or cannot stay level, from overfeeding and gulped air to infection, what a fast and a diet change can do, and when to worry.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/gasping-at-surface/https://gold.fish/health/gasping-at-surface/Why a goldfish gasps at the surface, from low oxygen and ammonia to gill flukes and chlorine, the emergency steps to take right away, and when to see a vet.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/loss-of-appetite/https://gold.fish/health/loss-of-appetite/Why a goldfish stops eating, from poor water and cold temperatures to stress, constipation, parasites and old age, and how to tell a pause from a problem.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/red-streaks/https://gold.fish/health/red-streaks/Why red streaks appear in a goldfish's fins or body, from ammonia burns to septicaemia, which water tests to run first, and when to call a vet.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/sitting-on-the-bottom/https://gold.fish/health/sitting-on-the-bottom/Why a goldfish sits on the bottom of the tank, from ammonia and cold water to flukes and bullying, how to tell resting from illness, and what to check first.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/swollen-abdomen/https://gold.fish/health/swollen-abdomen/What a swollen belly on a goldfish can mean, from constipation and eggs to dropsy, how to check whether the scales are raised, and when to see a vet.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/torn-fins/https://gold.fish/health/torn-fins/Why goldfish fins tear, fray or rot, how to tell physical damage from fin rot and fungus, what clean water does for regrowth, and when to see a vet.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/health/white-spots/https://gold.fish/health/white-spots/What white spots on a goldfish can mean, from ich to normal breeding tubercles, which water checks to do first, and when a fish needs veterinary help.Tue, 01 Sep 2026 00:00:00 GMThealthhttps://gold.fish/breeds/black-moor/https://gold.fish/breeds/black-moor/Black Moor goldfish care guide covering the velvet-black colour and why it fades, telescope eyes, tank requirements, feeding, health and suitable tankmates.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/bubble-eye/https://gold.fish/breeds/bubble-eye/Bubble Eye goldfish care guide covering the fluid-filled eye sacs, injury prevention, tank setup, feeding, health considerations and suitable slow tankmates.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/celestial-eye/https://gold.fish/breeds/celestial-eye/Celestial Eye goldfish care guide covering the upturned eyes, poor vision, tank setup, sinking food, health considerations and suitable slow-moving tankmates.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/comet/https://gold.fish/breeds/comet/Comet goldfish care guide covering the long forked tail, adult size, aquarium and pond requirements, feeding, health and the red-and-white sarasa variety.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/common-goldfish/https://gold.fish/breeds/common-goldfish/Common goldfish care guide covering adult size, lifespan, pond and aquarium requirements, feeding, health and why this single-tailed fish soon outgrows a bowl.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/fantail/https://gold.fish/breeds/fantail/Fantail goldfish care guide covering the egg-shaped body and double tail, adult size, tank needs, feeding, health and why it is the best first fancy goldfish.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/lionhead/https://gold.fish/breeds/lionhead/Lionhead goldfish care guide covering the dorsal-less body, heavy wen, differences from the ranchu, tank requirements, feeding, health and its poorly documented origins.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/oranda/https://gold.fish/breeds/oranda/Oranda goldfish care guide covering the wen, adult size, tank requirements, feeding, health considerations and suitable tankmates for this popular fancy breed.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/pearlscale/https://gold.fish/breeds/pearlscale/Pearlscale goldfish care guide covering the domed scales, round body, buoyancy risks, temperature needs, tank requirements, feeding and suitable tankmates.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/ranchu/https://gold.fish/breeds/ranchu/Ranchu goldfish care guide covering the dorsal-less arched back, wen, adult size, tank requirements, feeding, health, top-view judging and Meiji-era origins.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/ryukin/https://gold.fish/breeds/ryukin/Ryukin goldfish care guide covering the shoulder hump, adult size, tank requirements, feeding, buoyancy risks and suitable tankmates for this fancy breed.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/shubunkin/https://gold.fish/breeds/shubunkin/Shubunkin goldfish care guide covering calico colouring, nacreous scales, London, Bristol and American types, tank and pond needs, feeding and health.Tue, 01 Sep 2026 00:00:00 GMTbreedshttps://gold.fish/breeds/telescope/https://gold.fish/breeds/telescope/Telescope goldfish care guide covering the protruding eyes, poor eyesight, safe decor, tank requirements, feeding and suitable tankmates for this fancy breed.Tue, 01 Sep 2026 00:00:00 GMTbreeds