Two to four pellets, once or twice a day.
That is the answer, and almost nobody believes it the first time. It looks like starvation. It is not. A betta’s stomach is roughly the size of its eye, and the serving suggestion on most packaging is several times what the fish can use.
Why the packaging is wrong
Food is sold by volume, and a tub that empties faster gets replaced sooner. That is the uncharitable reading and it is probably part of it.
The more generous reading is that “a pinch” and “as much as they eat in two minutes” are the standard phrasings across the whole aquarium trade, and a betta will happily eat for two minutes past the point that suits it. Bettas evolved where food arrived unpredictably, so eating everything available is correct behaviour for a wild fish and a problem for a captive one.
The amounts
| Fish | Per feeding | Times a day | Daily total |
|---|---|---|---|
| Adult betta | 2 to 4 pellets | 1 to 2 | 4 to 6 pellets |
| Small or young | 2 to 3 pellets | 2 | 4 to 6 pellets |
| Giant betta | 4 to 6 pellets | 2 | 8 to 10 pellets |
| Fasting day | none | 0 | once weekly |
Pellet sizes vary between brands, so treat the counts as a starting point and adjust to the actual pellet. A useful sanity check: the total daily food should be roughly the volume of the fish’s eye.
Overfeeding does two separate harms
To the fish: a bloated betta is uncomfortable, and persistent overfeeding is associated with constipation and swim bladder problems. A distended belly with a fish struggling to hold itself level is the pattern to watch for.
To the water: every pellet not eaten sinks, breaks down and becomes ammonia. In a small tank this is a meaningful load, and the fish is then dealing with poor water on top of a full gut.
The second harm is the one people miss. Overfeeding a betta is a water quality problem as much as a dietary one.
Reading your fish
Body shape tells you more than behaviour does.
A well-fed betta has a gently rounded belly that follows the body line. Slightly concave and the fish needs more. Visibly swollen, especially if it persists into the next day, and the fish needs less.
Behaviour is unreliable. A betta that rushes the surface every time you pass the tank is not necessarily hungry, it is a betta that has learned you are the source of food.
The fasting day
Skip one day a week for a healthy adult. It gives the digestive tract time to clear, and keepers who do it report less constipation.
Two cautions. Do not fast a fish that is already unwell, underweight or young and growing. And do not compensate the next day by feeding double, which defeats the point.
Practical routine
Feed at roughly the same time each day, since a predictable schedule makes it easier to notice a fish that has gone off its food.
Count the pellets out rather than shaking them from the tub. It takes a second and it is the difference between the correct amount and three times it.
Watch the fish eat. This is the most useful thirty seconds of the day: you see whether it is interested, whether it is swallowing or spitting, and whether anything is left.
Remove leftovers within a few minutes with a net or a turkey baster.
If food is being refused
A few days of disinterest after a move is normal. Beyond that, test the water before changing anything about the food. Ammonia and nitrite are the most common reason a betta stops eating, and no feeding adjustment fixes bad water.
After that, check the temperature, then try soaking the pellets or offering a single thawed bloodworm, which very few bettas refuse.
Where to go next
Portion size is half of feeding. What is actually in the food is the other half.