Silver dollar fish are herbivorous, meaning they eat plants, so they're fine with other herbivorous fish or, for that matter, any fish that isn't big enough to eat them.
According to my personal openion, golden fish can be mixed with silver dollar fish. Gold fish normally donot attack oher fishes but it needs special care over other fishes.
Silver Dollars are herbivores and not meat eaters. Your other fish should be fine. Loach, rams, catfish ,oscar cichlid, bala shark,white angels can be put.
we may add the cubbies , cold fish in the silver dollar fish tank. these type of fishes are grown as groubs larger than three. It may grows upto 4 diameter.
Silver dollar fish tend to be peaceful around other fish species. Angel fish that are about the same size as yours are recommended. Pictus catfish is another option.