These are some pond goldfish.
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Some pond goldfish can live in aquariums, but if your goldfish is sloutching around or is not active, you should either get a bigger tank, another goldfish for your other goldfish to play with, or you could put them in a pond.
The biggest fancy goldfish I have ever seen. But gold fish surprisingly can get that big. They grow to fit their habitat. So if you have a 1 pond goldfish in a 30 gallon tank with no other fish you will probably have ONE BIG GOLDFISH!!!!!!!
