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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.
Very rarely does a goldfish harm another goldfish, nor do the males harm the females during breeding. The only real threat that goldfish present to each other is competing for food. Commons, comets, and other faster varieties can easily eat all the food during a feeding before fancy varieties can reach it.