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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.
Pet stores supply live and frozen invertebrates as goldfish food; you also can feed them some animal foods humans eat. Goldfish eat fish eggs, bloodworms, mosquito larvae, tubifex worms, daphnia and live and frozen brine shrimp.