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In the wild, goldfish eat crustaceans, plants, insects and will sometimes even eat smaller fish. While you obviously canât match their natural diet exactly, you should try to feed your goldfish food that is similar to what they would eat in the wild.
Fish food is all protein, usually, and eating only fish food usually helps constipation happen to your poor goldfish. Imagine humans eating only meat! So I always feed my goldfish pieces of lettuce and the insides of cooked frozen peas.