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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.
What not to feed. 1  While goldfish are omnivores, they do not need a lot of extra proteins in their diet. 2  Never feed your goldfish bread! 3  Donât give foods to your goldfish that contain extra ingredients like salt or dairy.  If you have a pond, donât continue feeding during winter.