I have 2 false percs and 1 yellow tail damsel. One of the clowns and the damsel are doing excellent, very active and eating well. I've had the clowns for about 1 1/2 weeks now. The second clown is always hiding. It was coming out to eat but stopped doing that about 2 days ago. Physically it looks good besides a rip in it's tail fin. Color is bright and there are no spots or marks on it. Any ideas?