well, goldfish and tropical fish shouldn't really ever be put together. They require different temps, different foods, etc. Also, I believe that some goldfish, once they get big, will eat/nip/chase anything that can really fit into their mouths.
Live in the Western MD/West Virginia/DC Metro Area?
Join our very active regional forum Here
Like the advice someone just gave you? Add to their reputation! Click on the balance icon underneath their username and let them know.