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I got a Coral Beauty Angel this past Sunday at Petco. It seems to be doing great. I was looking at it this afternoon and there's a spot on its body near the pectoral fin that look like a scratch (for lack of a better description). I have two clowns in the tank and niether of them, as far as I can tell bother the Angel at all. The Angel is the only on of the three fish that actually swims in and through the Live Rock. Could it be that it bumped itself against the LR and knock off some scales. I don't ever see it "scratching" itself against the rock or anything else in the tank. If it did, this would indicate some type of disease (ich or marine velvet) right? Should I do anything?

Thanks