The best goldfish food

Most goldfish are fed the same tub of flakes for their whole lives, and most of the digestive and buoyancy complaints we hear about would be helped by changing what and how they are fed. The best goldfish foods are neither exotic nor expensive; what matters is format, ingredients and a bit of variety.

What to look for

The first question is whether the food sinks. Keepers commonly report that a goldfish feeding at the surface swallows air with each mouthful and that round-bodied fancies are then more prone to floating; there is no controlled evidence, and infection is among the causes of buoyancy trouble. A sinking staple is the sensible default all the same, especially for fantails, orandas, ranchus and ryukins. Our guide to sinking versus floating food goes into it.

The second is what the food is made of. Goldfish are omnivores that evolved grazing on plants, insect larvae and small invertebrates, and plant matter is part of their natural diet. A good label lists whole fish, krill or insects first and includes spirulina, kelp or other plants, rather than leaning on wheat and soy as bulk.

Last, how much you feed matters at least as much as what. Small meals eaten within a minute or two, one to three times daily, is the guidance in our article on how often to feed goldfish, and overfeeding is often a bigger problem than the wrong brand.

What to buy for your fish

The picks below cover different jobs, and which one you need depends mostly on the shape of the fish and the temperature of the water.

Your fish	The staple to buy	The thing to add
A young fancy	A small sinking pellet	Blanched vegetables, from week one
An adult fancy	A sinking pellet, soaked if firm	Gel food, replacing part of the ration
A common, comet or shubunkin	A larger sinking or slow-sinking pellet	Insect-based granules for variety
Pond fish in cool water	A wheatgerm pond pellet	Nothing rich until the water warms
A fish with buoyancy trouble	Gel food, or a soaked sinking pellet; keepers report these help some fancies, though there is no controlled evidence and infection is among the causes	Peas, and a look at how it is fed
Fry and very young fish	A powdered or crumbled growth food	Live food, if you can get it

The column that surprises people is the third. A prepared food is not meant to be the whole diet, and the additions are what turn an adequate diet into a good one — goldfish nutrition explains what the long, stomachless goldfish gut is actually built to process, and it is not pellets alone.

Cool water changes the answer. Digestion slows progressively as the water cools, and goldfish eat less of their own accord, so a rich, protein-heavy pellet is a poorer fit. Feeding through the seasons has the temperature bands, and they matter more than the brand.

Buy a rotation, not a food

The framing of this page — and every page like it — is slightly wrong, because the right purchase is a small set rather than a single best tub.

What a sensible shelf holds:

• A sinking staple, for most days. This is the one to spend on.
• A plant-heavy food, spirulina or vegetable based, for a couple of days a week.
• One richer food — insect-based granules, or a frozen food — two or three times a week in rotation.
• Vegetables from your own kitchen, which cost nothing and are the part most goldfish diets are missing entirely. Vegetables for goldfish covers preparation.

Why rotation rather than the perfect single food: no manufacturer knows exactly what a goldfish needs, variety covers the gaps in any one recipe, and a fish accustomed to several foods is a fish that will still eat when one is discontinued or when it is unwell. Goldfish pellets makes the same argument as a practical reason to keep a second brand open.

And it is not an expensive shelf. Three modest tubs and a bag of frozen food last a single goldfish the better part of a year.

Tub size, and a mistake that costs money

A costly habit in feeding goldfish is buying too much food at once.

Dry food degrades from the moment the seal is broken. Fats oxidise, vitamins — particularly vitamin C — break down, and the decline is measured in weeks rather than years. The date on the tub refers to an unopened tub.

A small goldfish eats very little. A few grams a week, less in cool water. A large tub bought for the price per gram will still be half full a year later, and by then it is not the food you bought.

So: buy the smallest tub you will finish within about two months, three at most, and if only a large one is available, decant a few weeks’ worth into a small airtight pot and keep the rest sealed, cool and dark. The working pot doubles as a portion measure, which how often to feed goldfish argues is the single best defence against a ration quietly growing.

Avoid the bargain multipack entirely. It is one large tub in several boxes and it goes stale on the same schedule.

Where you buy it matters

Freshness is a supply-chain property, not a brand property.

High turnover beats a good shelf. A busy online seller often has fresher stock than a small shop where a tub has sat under a spotlight for a year, and a slow online seller is the worst of both. Check the date the day it arrives and return it if it is close.

Watch what the shelf is designed to sell you. The prominent position usually holds floating flakes with a goldfish on the pack, holiday blocks and colour-enhancing formulas, none of which is what this page recommends. Goldfish flakes is fair to the format and still ends up preferring a pellet, and goldfish treats explains why the treat shelf is mostly selling to the owner rather than feeding the fish.

Read the back, not the front. Reading a fish food label covers the analysis panel and ingredient splitting, which is the trick that lets a food list four kinds of wheat below one kind of fish and appear to lead with fish.

What not to buy at all

Distinct from the picks, and worth its own list.

• Holiday and vacation blocks. A dissolving mass of food in a tank nobody is watching. A healthy, well-conditioned adult can generally go a few days without food, and up to about a week in a cool room; leaving goldfish while away covers the options.
• Automatic feeders loaded with flakes, for the same reason in slow motion.
• Freeze-dried foods fed dry. Keepers report that they swell after swallowing, so rehydrate them first.
• Colour foods as a permanent staple. They work, within the limits of what the fish is genetically able to show, and a healthy fish in reasonable light does not need them.
• Medicated food bought speculatively. Feeding a medicated food to a fish with no diagnosis is the same mistake as dosing a tank on a hunch — feeding a sick goldfish covers what actually helps.

Our picks explained

Northfin Goldfish Formula: best overall

We like this pellet for its short, readable ingredient list and its plant content, and because its two sizes cover any goldfish from a juvenile fancy to an adult single-tail. It sinks slowly and holds together, which keeps the water clearer. The pellets are firm, so some keepers soak them briefly for fancies, and outside North America it can be hard to find.

Saki-Hikari Fancy Goldfish: best for fancy goldfish

If money is no object, this is a sinking pellet serious fancy goldfish keepers often name. It sinks cleanly, does not cloud the water, and comes in an everyday and a colour-enhancing formula. It costs more per gram than anything else here, and the manufacturer’s probiotic claim is not something we can assess. Buy the small pouch; food loses nutrients once opened.

Hikari Lionhead: best for head-growth breeds

Lionheads, orandas and ranchus are bred for their head growth, and this small sinking pellet was designed for them. It is one of the most established fancy goldfish staples, which counts for a lot when hands-on data is scarce. Its richness makes it a poor match for pond fish in cool water, and the tiny pellets vanish into gravel.

Repashy Super Gold: best gel food

Gel food is the nearest a prepared food comes to the soft, wet diet goldfish evolved eating. You can blend in peas, spinach or a medication your vet prescribes, and keepers of round-bodied fancies often report fewer floating episodes when gel replaces part of the pellet ration, though there is no controlled evidence. Our gel food guide covers preparation; it needs fridge space, and overfed gel fouls water quickly.

Omega One Goldfish Pellets, Small Sinking: best value

Not every goldfish needs a boutique food, and this sinking pellet is a step up from supermarket flakes at a modest price. Its maker describes an ingredient list that leads with whole seafood (check the current label), it sinks, and the medium size suits hungry comets. It is richer in animal protein than some keepers want as a sole staple, so pair it with vegetables.

Fluval Bug Bites Goldfish Formula: best for variety

Wild goldfish eat a lot of insect larvae, and an insect-based food is a more useful addition to the rotation than another fish-meal pellet. Fussy fish take to it quickly. The granules sink slowly and are light enough to drift into the filter intake, so drop them near the bottom and feed them two or three times a week rather than daily.

What we would skip

Floating flakes as the only food, for the reasons above. Any food where wheat or soy is the first ingredient. Huge tubs that go stale long before one fish finishes them. Freeze-dried foods fed dry, which keepers report swell after swallowing. And colour-enhancing foods fed constantly, which are unnecessary for a healthy fish in good light.

A goldfish fed a sinking pellet most days, blanched vegetables a few times a week and the occasional gel or insect meal is eating better than many goldfish do. None of it costs much, and the difference shows in body shape, colour and how rarely you see a fish floating.