I have a pair of false perculas that have been doing quite well in my new reef tank (2 months old), although just a few days ago I noticed that he had some black spots on different parts of his body. Is it due to stress maybe? I've been having some issues recently with my return pump. It is pumping the water faster than the gravity syphon can feed water to it so there have been days when i come home from work or when I wake up in the morning that the pump is sucking in air and my tanks has been filled with tiny air bubbles. I installed a valve to restrict the flow back into the tank but even with it almost all the way shut it occasionally sucks some air still. I was reading about black ich and I don't really think that is it, but I am a noob and I could be wrong. Parts of his black bands seem to be bleeding into the orange parts of his body. Any thoughts? suggestions?