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The next rule will be not overfeed your bettas. Carefully dose the meals; because even if the fish eats all you allow him, when called he'll produce much more waste when overfed, and the pollution amount of the jar he is at will rise above safe range This problem is smaller you keep your betta in the larger fish tank. Remember not to leave uneaten food on the inside aquarium! When your betta and also the rest belonging to the fish are finished eating, you must remove all uneaten left food.