Ron, I just got back in town so this may be a little late. I've never figured out exactly what it is that you are describing but I have seen it a number of times on wild rams and tetras. I'm not sure that I've ever lost anything to it (and I've had it on tetras for over 6 months before it disappeared on its own) but Ampicillin will clear it up if you want to medicate the fish. I usually use Ampicillex from Aquatronics. Just follow the directions on the package. Mark