Can you keep fantail goldfish with any other coldwater fish?

I have two fantail goldfish and I was wondering if they are compatible with any other coldwater fish, or should I keep them with their own? I do have two catfish and they don't cause any problems, mainly because they're always hiding or on the bottom of the tank. Is it recommended to put fantails with... show more I have two fantail goldfish and I was wondering if they are compatible with any other coldwater fish, or should I keep them with their own? I do have two catfish and they don't cause any problems, mainly because they're always hiding or on the bottom of the tank.

Is it recommended to put fantails with any other fish?
4 answers 4