we have a coral beauty that has been suffering for sometime. Our Hippo tang likes to chase it and that might be the cause of most of the problems. We have a 55 gal. tank all water levels are doing good. She has not eaten in a week or more. it looks as though her fins are rotting away. also she has a whitish cottony thing on her side and along the top of the dorsal fin. last night we put her in a quartine tank with melafix and pimafix. what does she have and can she be saved?