What do betta fish eat daily? A floating carnivore pellet, plus live or frozen food for variety — and one shelf-life number most owners get wrong. Seriously Fish puts Betta splendens at 22–30 °C and pH 6.0–8.0.
| Body length (nose to tail base, fins excluded) | Pellet | Per feeding | Per day | Hard cap | Gap |
|---|---|---|---|---|---|
| up to 1.5 in | micro pellets | 6 | 2 feedings | 6 | 2 h |
| 1.5–1.75 in | betta pellets | 3 | up to 3 feedings | 5 | 3 h |
Growth rule: add 1 pellet per 1/4 inch of growth. Hikari’s published protocol — manufacturer guidance, and the only complete betta-specific dose sheet we could source. See also the betta species guide and tank size guide.
What Betta Fish Eat in the Wild
Wild Diet: Invertebrates at the Water Surface
Seriously Fish describes Betta splendens as likely to prey on aquatic and terrestrial invertebrates. It says captive bettas should be offered live or frozen foods such as Artemia or bloodworm “regularly to ensure development of optimal colour and condition.”
Why Habitat Decides the Menu
The same source places the species in shallow, shaded waters that “sometimes contain little dissolved oxygen.” That is why surface feeding pays, and why their behavior and temperament tracks the top of the tank.
Staple Foods for Betta Fish
Why Betta-Specific Pellets, Not Tropical Flakes
Two Merck Veterinary Manual rules make this sourced, not hobby consensus. Feed “should be in particles easily ingested by the fish,” because “flaked feeds may be too large for a small-mouthed fish.” A surface feeder “should be fed feeds that float.”
If You Only Have Flakes
Merck’s fix for a too-large flake is mechanical, not a different food: such feeds “can be crushed to enable easy ingestion.” Crushing also settles the weight mismatch that makes pellet counts look odd beside flake counts. Merck’s own figures: “flaked feeds tend to be much lighter than pelleted feeds,” so three flakes and three pellets are not the same meal. Hikari markets its micro pellet line on exactly that argument, built to “eliminate the need for you to crush the flakes before feeding.” Crushing is a workaround; a pellet sized to the mouth is the fix.
How Many Pellets per Meal
So what do betta fish eat at the counter, and how much? Feed one at a time, confirm each is swallowed, and “do not overfeed. Overfeeding can be detrimental to the betta and the water quality.” Cadence matters too: “a smaller number of pellets per feeding many times per day is better than once- or twice-a-day feeding.”
- Tetra Betta PLUS Floating Mini Pellets — affordable daily staple in the floating format a surface feeder needs.
- Hikari Betta Bio-Gold — the pellet the dosing table is written against.
Protein Targets: How to Read a Betta Food Label
What We Can Source — and What Nobody Has Published
Search what do betta fish eat and one number comes back every time: “40-50% protein.” No authority or manufacturer publishes it for Betta splendens. Merck says why: “nutritional requirements are known for only a handful of fish species.” Beyond carnivore, omnivore or herbivore, “the amount of protein and lipids required is unknown.”
The Protein Baseline That Is Actually Documented
One directional statement survives, from Merck’s Nutrition in Fish page: “Carnivorous fish should be fed a diet with high amounts of protein and fat.” No percentage is attached, and we won’t attach one. The home rule: “pellets should not be allowed to dissolve before eating.”
The Label Checklist
- Read crude protein off the guaranteed analysis — on a carnivore’s food it shouldn’t be the smallest number on the bag.
- Match particle size to the fish’s mouth; prefer a floating pellet for a surface feeder.
- Note the batch date, then check the freshness window below.
Feed Freshness: The Number Most Owners Get Wrong
Merck’s Veterinary Manual is unambiguous, and most hobby guides are far too generous:
| Feed storage | Discard after |
|---|---|
| Opened container at room temperature | 2 months |
| Commercial feed kept in the freezer | 6 months |
| Frozen brine shrimp, bloodworms, mysids, glassworms | 1 year — never refreeze after thawing |
Fish feeds “usually have a high protein and oil content, which can deteriorate rapidly.” A container opened since spring should be replaced.
Storage method matters as much as the discard date. Merck’s instruction is specific: “Dry feeds should be kept in a pest-proof container and in an area of low humidity and temperature.” The reason is not vague spoilage — “high humidity and high temperature result in degradation of the diet, promotion of mold growth and potential mycotoxin production, and rancidity.” A tub left open on a warm shelf can fail before the two-month line, not after it.
Treats and Supplemental Foods
Live, Frozen, and Freeze-Dried Compared
- Fluval Bug Bites Betta Granules — black soldier fly larvae, closely matching the insect diet bettas eat in nature.
- Fluval Freeze Dried Bloodworms — the default treat, safer on parasites than live bloodworms. See can betta eat shrimp.
| Format | Pros | Cons |
|---|---|---|
| Freeze-dried | Safe (no parasites), long shelf life | Lower moisture — soak before feeding |
| Frozen | High nutrition, retains texture | Needs freezer storage, slight parasite risk |
| Live | Most natural, stimulates hunting | Risk of introducing parasites |
How Often Treats Belong in the Diet
Two sources frame this as a supplement, not a schedule. Hikari: freeze-dried or frozen bloodworms and brine shrimp “should be used sparingly.” Seriously Fish: offer live and frozen foods “regularly.” Neither gives a weekly number, so the pellet table stays the anchor.
Switching Between Foods
Merck’s case for variety is nutritional, not novelty. It holds that “feeding a wide variety of feeds is one way to try to meet the nutritional requirements.” Live feeds, it adds, “can be varied with diverse commercially prepared feeds,” and the practice “will also help prevent animals from eating only one type of feed.” That last clause is the practical one. A betta raised on one pellet brand can refuse a different one outright, and the refusal reads as illness rather than fussiness. So the pellet your fish already eats should stay the staple, and the live or frozen food should be the variable, not the reverse.
No source we reached sets out a transition schedule. How many days to mix old into new, or when to swap outright, is keeper habit rather than published protocol. Treat any such number you meet as guidance, not authority.
Foods to Avoid
Foods Bettas Cannot Digest
Keeper practice, not a veterinary finding — no authority states bettas cannot digest these:
- Bread, crackers, human food — swell in the gut, break down fast
- Goldfish food or flakes — formulated for omnivores; Merck ties hepatic lipidosis to “a high percentage of carbohydrates in the diet, a high amount of lipids, and rancidity”
- Mammal meat — fat content bettas process poorly
- Citrus, onion, garlic — commonly flagged as hard on the gut
See also can betta eat cucumber.
Overfeeding Is the Bigger Risk
Seriously Fish adds that bettas “seem particularly prone to obesity.” The cleanup rule carries no time limit: “remove any uneaten food after the feeding period.”
What to Do When Your Betta Won’t Eat
Step 1 — Test the Water First
Most refusals are environmental. Check aquarium water parameters first: any ammonia or nitrite above zero warrants a water change.
Step 2 — Confirm Temperature
Two sourced numbers meaning different things. Seriously Fish gives the tolerance range, 22–30 °C (72–86 °F); Hikari gives the target, “approximately 78 degrees Fahrenheit is the ideal temperature.” A cold tank slows their metabolism and they stop eating.
Step 3 — Check the Food’s Freshness
Use the table above: 2 months opened at room temperature, 6 months frozen. Try a pinch from a newly opened container. If your betta eats the fresh batch and ignores the old one, that’s the answer.
Step 4 — Change the Texture
Some bettas refuse pellets but take live food immediately. If they take it, the issue is texture preference, not health.
Step 5 — Rule Out Constipation
A bloated belly plus refusal is usually constipation. Rest the fish, then offer high-fibre live food such as daphnia. The boiled green pea remedy common in forums has no veterinary sourcing.
When to Escalate to a Vet
Escalate on observable signs, not a day count — clamped fins, lethargy, white spots. Merck’s deficiency list is a vet’s vocabulary: “poor growth, deformities, a depressed immune system, hepatic lipidosis, and impaired metabolism.” See the betta diseases guide.
Feeding Schedule by Life Stage
Fry
Merck’s rule: fry and fingerlings “can be fed up to 5% of their body weight daily.” A home fry isn’t weighed, so treat that as the order of magnitude — brine shrimp and crushed pellets, more often than adults.
Juveniles
Hikari’s protocol: under 1.5 inches, 6 micro pellets twice a day. Add 2 pellets per 1/4 inch of growth, never more than 6 at one feeding, extra feedings at least 2 hours apart.
Adults
The dosing table from the schedule’s view: 3 pellets, up to 3 times daily, never more than 5 at one feeding, 3 hours between extras. Merck frames the magnitude — “ideally, adult fish should be fed 3% of body weight daily for maintenance.”
Weighing the Ration Instead of Counting Pellets
Merck gives the ration as a share of body weight: “ideally, adult fish should be fed 3% of their body weight daily for maintenance.” Counting is not dosing, because “various types of feeds have dramatically different weights.” A kitchen scale settles it. Weigh the daily ration once, split it across the feedings in the table above, and stop guessing. Merck also draws a line most hobby guides blur: “Most aquarium fish should be fed at least daily, except for carnivorous fish that ingest large meals. These may be fed once or twice a week.” Bettas are carnivores that take tiny meals rather than large ones, so they belong in the daily group, not the twice-a-week exception.
About Fasting Days
Skipping a feeding day is a keeper preference, not a prescribed protocol: no source we reached recommends or forbids a weekly fast. Cut portions before cutting days.
Feeding During Travel and Time Away
Trips Under 3 Days
Skip feeding. An adult betta handles a short fast comfortably, and skipping cuts waste output so water quality stays stable.
Trips of 4-7 Days
A battery feeder works if you test it for 3 days first and confirm the real output. Derive the setting from the adult dosing table: 3 pellets a day, hard cap 5 per release.
Trips Over a Week
Ask a fishkeeper to visit every other day. Pre-portion pellets from the same table into a labelled organizer, one compartment per visit, with a note: 3 pellets each, nothing else.
Signs of Improper Diet
Constipation and Bloating
A swollen belly with stringy white faeces signals constipation; a persistent round belly signals bloating. Reduce dry pellet intake, increase freeze-dried or frozen foods.
Faded Colour and Poor Condition
Faded colour often points at nutrition rather than genetics — Seriously Fish’s sourced basis is live and frozen foods supporting “optimal colour and condition.” Upgrade the pellet first.
Appetite Loss as a Disease Signal
Lethargy can mean underfeeding or poor water quality — check parameters first. A loss persisting alongside Merck’s deficiency signs belongs with a vet.
Spine and Thyroid Problems
Merck lists what a diet short of more than calories does to a fish. Vitamin C is the one hobbyists meet as a spine problem. Merck: “Fish require ascorbic acid, delivered in the feed.” Inadequate dietary vitamin C “can result in a condition called broken back disease,” where “severely affected fish exhibit extreme scoliosis.” Iodine runs the other way — “Iodine deficiency can result in thyroid hyperplasia,” recorded in both elasmobranchs and teleosts. Neither is a common betta presentation and neither is yours to diagnose; they are reasons to feed a complete feed and let a vet read the signs.
Sources
Accessed 2026-10-08. Seriously Fish · Merck — Nutritional Diseases of Fish · Merck — Nutrition in Fish · Hikari Betta Bio-Gold · Hikari Betta Owner Tips
