Siamese fighting fish
Diet

Betta splendens is naturally carnivorous, feeding on zooplankton, small crustaceans, and the larvae of aquatic insects such as mosquitoes, as well as insects that have fallen into the water and algae. Contrary to some marketing materials in the pet trade, bettas cannot subsist solely on vegetation or the roots of plants.

Bettas can be fed a varied diet of pellets, flakes, or frozen foods like brine shrimp, bloodworms, daphnia and many others. Due to their short digestive tracts—a characteristic of most carnivores —bettas have difficulty processing carbohydrates such as corn and wheat, which are commonly used as fillers in many commercial fish foods. Thus, regardless of the source, a proper betta diet should consist mostly of animal protein.

Bettas are susceptible to overfeeding, which can lead to obesity, constipation, swim bladder disease, and other health problems; excessive food may also pollute the water. It is generally advised to feed a betta at least once daily, with only the amount of food it can eat within 3–5 minutes; leftover food should be removed.
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