In my 55 gal malawi setup I have noticed that one of my taiwan reef fish has been lurking in the corner. He is still coming out at feeding time but his fins are in bad shape. I have been watching the tank closely, and have seen no evidence of aggression. What should I do? It is only one fish that has this problem, but i'm scared it could be contageous. Should I do a salt treatment. Advice is greatly appreciated.
