What to Feed Aquarium Fish: Flakes, Pellets, Frozen and Live Food

By Aquarium Guides Editorial Team · Updated October 17, 2026

Last Updated: October 17, 2026

Most aquarium fish do best on a good-quality flake, micro-pellet or sinking pellet matched to their diet type as the daily staple, with frozen, freeze-dried or live foods and fresh vegetables used as supplements, fed in amounts the fish finish within about two to three minutes. The right food depends on whether your species is a carnivore, herbivore or omnivore and on where it feeds in the tank: surface, mid-water or bottom. Overfeeding is the most common mistake and does more harm than a skipped meal.

Fish Food at a Glance

Match Food to Diet Type

Carnivores

Carnivores such as bettas and many predatory cichlids need protein-rich foods: carnivore pellets and frozen or freeze-dried bloodworms, brine shrimp and similar items. Veterinary and aquarium guides describe higher protein requirements for these fish than for herbivores. PetMD cites roughly 40 to 55 per cent protein for carnivores, though the exact figure varies by species and life stage. Some keepers feed carnivores bigger meals less often, and some adults are given a fasting day each week, although this is a hobby practice rather than a firm rule.

GloFish Special Flake Food for Fish, 3.17 Ounces, Treat GloFish and Small to Mid-Sized Tropical Freshwater Fish to a Nutritionally Complete Blend

Included for 'What to Feed Aquarium Fish: Flakes, Pellets, Frozen and Live Food' because the listing specifies 3.17 Ounces, details this guide uses to compare options.

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TetraColor Tropical Flakes Color Boosting Fish Food, 7.06 oz | For Mid & Bottom-Feeding Tropical Fish, Supports Immune System & Reduces Stress, Clean & Clear Water Formula, Feed Daily

Included for 'What to Feed Aquarium Fish: Flakes, Pellets, Frozen and Live Food' because the listing specifies 7.06 oz and For Mid & Bottom-Feeding Tropical Fish, details this guide uses to compare options.

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Tetra Goldfish Flakes Fish Food, 2.2 oz | Nutritionally Balanced Daily Diet for Goldfish & Small Koi, Color-Enhancing, Highly Digestible, Clean & Clear Water Formula

Included for 'What to Feed Aquarium Fish: Flakes, Pellets, Frozen and Live Food' because the listing specifies 2.2 oz and Nutritionally Balanced Daily Diet for Goldfish & Small Koi, details this guide uses to compare options.

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Aqueon Shrimp Pellets Sinking Food for Tropical Fish, 6.5 oz | Bottom feeder fish food, approx. 9mm fish food pellets for catfish, loaches, cory catfish and South American cichlids

Included for 'What to Feed Aquarium Fish: Flakes, Pellets, Frozen and Live Food' because the listing specifies 6.5 oz and Bottom feeder fish food, details this guide uses to compare options.

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Herbivores

Herbivores, such as many plecos, some African cichlids and certain livebearers, need plant matter: algae wafers, spirulina-rich foods and blanched vegetables like courgette or spinach. Many graze on plant matter or algae through the day, so smaller, more frequent meals or constant access to algae suits them. Feeding a high-protein carnivore diet to a herbivore can cause digestive problems.

Omnivores

Most community fish, such as tetras, rasboras, corydoras, barbs, many livebearers and goldfish, are omnivores. They do best on a quality staple plus varied supplements. A common weekly plan in retailer guides is a daily quality flake or pellet, frozen foods two or three times a week and vegetable-based foods once a week.

Feeding Zones: Who Eats Where

In a mixed tank, quick surface feeders can finish everything before bottom fish see it. Feed near the surface first, then drop sinking food in a different corner, and consider feeding bottom dwellers after lights are dimmed if they are nocturnal.

Flakes vs Pellets

PetMD notes that pellets can keep their vitamins more stable than flakes, which can lose a large share of vitamins within a short time in water. Hobby guides also say pellets tend to produce less waste for larger fish. Small fish with tiny mouths often need flakes or crushed micro-pellets. Goldfish and many cichlids do better on pellets than flakes according to hobby guides, partly because pellets are easier to digest and measure. Whichever you choose, buy small containers and use them within a few months, since vitamins degrade after opening.

How Much and How Often

Sources give a range of time limits: from under a minute for flakes to two to five minutes (PetMD) or longer for slower feeders. A practical midpoint used by multiple guides is to offer only what the fish eat in about two to three minutes. Adults usually do well with one or two feedings a day, while juveniles and fry need smaller meals more often (guides suggest two to four small feedings). Larger carnivores may need fewer feedings.

1. Start with a small pinch or a few pellets per fish and watch.
2. If everything is eaten in under a minute and fish still search, add a little.
3. If food reaches the bottom uneaten, reduce next time.
4. Remove leftovers after a few minutes with a net or siphon.
5. Some keepers use one fasting day per week for adult fish to aid digestion; this is a common hobby practice rather than a requirement.

Signs of Overfeeding

PetMD lists obesity, swim bladder disorders, constipation and poor water quality among the consequences of overfeeding.

Frozen, Freeze-Dried and Live Food Safety

• Not complete on their own. Frozen, freeze-dried and live foods are supplements. Fed alone they can lead to nutritional gaps.
• Thaw frozen food in a little tank water before feeding and discard the melt water if cloudy.
• Be cautious with wild-collected live food. Such items may carry parasites or disease. Cultured options such as brine shrimp or daphnia from reputable sources are safer.
• Avoid feeder fish and mammal meat. They can transmit disease and are poor nutrition for most species.
• Live food can make fish picky. PetMD warns that regular live food may reduce interest in prepared diets.

Vacation and Missed Meals

Healthy adult fish can usually go without food for around three to seven days, according to several hobby guides, with tropical species at the shorter end and coldwater species such as goldfish sometimes cited at longer. Survival figures in some sources are longer (for example, goldfish are sometimes said to survive ten to fourteen days), but survival is not the same as good health, and fry and juveniles cannot fast safely.

Test any feeder for several days beforehand to confirm it dispenses a safe amount. Avoid a deep clean or filter overhaul right before leaving, and do not leave a sitter with a large bag of food, since many sitters overfeed.

Species Tips

• Bettas: carnivorous or insectivorous leaning; use high-protein pellets, with frozen foods as variety. Small portions only.
• Goldfish: omnivores that often do better on pellets than flakes; soaking dry pellets and adding greens helps avoid buoyancy trouble.
• Corydoras and loaches: need sinking food that reaches them.
• Plecos: many need plant matter and often wood to rasp; offer algae wafers and vegetables.
• Cichlids: diet varies from herbivorous to piscivorous; pick food for the specific species.
• Fry: need powdered or tiny live foods several times a day.

Weekly Feeding Schedule Example for a Community Tank

This is a pattern to adapt, not a rule. It follows the weekly structure many retailers describe: a daily staple, frozen foods two or three times a week, vegetables weekly and an optional fasting day. Adjust it to your species, and use smaller, more frequent meals for fry and juveniles.

Storing Food and Spotting a Poor Diet

Dry food loses vitamin content once the container is opened, so buy sizes you can use within a few months, keep the lid closed and store the container somewhere cool and dry. Throw out food that smells musty or has clumped. Frozen food should stay frozen until use and should not be refrozen after thawing. Signs of a poor or unbalanced diet include faded colour, thin bodies, stringy faeces, fish ignoring food, bloated bellies and slow growth in juveniles. A change in appetite can also signal disease or poor water, so test the water before blaming the food. When a fish stops eating for more than a few days, or shows a swollen or sunken belly, contact an aquatic veterinarian.

Feeding Tips for Shy and Competitive Tanks

In a busy community tank, fast fish can take most of the food. Spread the food across more than one spot, feed small amounts more than once, and watch whether slower or shyer fish are getting any. Nocturnal fish such as many loaches and catfish may need sinking food after the lights go out. Feeding at the same times each day also helps fish settle into a routine, and it makes changes in appetite easier to notice.

Frequently Asked Questions

What is the best food for aquarium fish?

A good-quality staple flake or pellet formulated for your fish’s diet type is the base, supplemented with frozen foods and vegetables. No single product suits every species, so match the food to whether your fish are carnivores, herbivores or omnivores.

How often should I feed my fish?

Most adult fish do well with one or two small feedings a day. Juveniles and fry need smaller meals more often. Many keepers include one fasting day a week for adults.

How much food is too much?

If food is left after two to three minutes, it is too much. Uneaten food rots, harms water quality and feeds algae. Reduce the amount and remove leftovers.

Can fish survive a week without food?

Healthy adult fish often can, and many guides say three to seven days is generally fine. Fry, juveniles and underweight fish should not be left that long, and survival is not the same as thriving.

Are flakes or pellets better?

Pellets tend to hold vitamins better and create less waste for larger fish, while flakes suit small mouths. Many keepers use both, depending on the species.

Do fish need live food?

No. A good prepared diet can meet nutritional needs. Live food can be helpful for picky eaters, conditioning and fry, but it carries a disease risk if wild-collected.

Do algae eaters need extra food?

Yes. Algae in a tank rarely provides enough nutrition, and many algae-eating fish and invertebrates need algae wafers, vegetables or specialist diets. Treat them as pets with dietary needs, not as a cleaning service.

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