It seems to keep coming and going in my main tank, I have a copperband and a clown left in the tank. The cleaner fish takes prety good car of the Copperband but it seems like whenever I add any more fish they start dying. I just lost a clown this morning. Maybe if I do the sterile thing it would help? I had an ICK outbreak that killed everything and I waited about 3 weeks to put anything backin. They did good for about 4 weeks, then it started again.