I'm still having the problem with the white film on my volitan lion. It has spread and caused the death of my regal tang, and copperband butterfly. The film is still not that bad on the lion, but I would still like to get rid of it. My other fish are in a Qt and have no symptoms. When is it safe to reintrooduce them? I add stress coat to the tank on the advice of a local pet store, but it had no effect.