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Goldfish are omnivores and cannibals so other larger goldfish can be predators to your smaller goldfish. Other predators are carp and koi. None swimming predators can include raccoons or house cats.

Only place goldfish into an aquarium with other similar sized goldfish. By having a deep enough and wide enough outdoor goldfish pond with a few aquatic plants living in it for your goldfish to hide in, will help them avoid becoming prey to those predators.
That all depends upon the size of the goldfish. In most cases the rule is 'if is small enough to fit in a predators mouth then that will eventually happen' It is common for people to feed goldfish to their Oscars.

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7y ago

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