My 40 gallon fowlr has been fully cycled for three months as of now. I have since added a pair of false percula clowns, a small sailfin tang and a long nosed hawk fish along with two shrimp, a cleaner and a pepermint. These fish have been in my tank for about a month and two weeks. My clowns, well actually one of them, of which is the smallest of the two, has never looked right. I noticed he always has a whitish looking slime on him. By the way, I always QT my fish. I don't think it's brooklynella because it would have killed him long ago. When they were in QT, his tail got damaged and it hasn't grown in full yet. The larger one does pick on him from time to time. Could this be stress or something or what? Both of them eat fine and always had. My tank has a salinity of 1.026 to 1.028 and a temperature of 80 degrees. Is this right or do I need to alter something?