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The fish looks to be in pretty good condition, I can just barely see the spot you are talking about. How long have you had it, and how long since you added any new fish to the tank? What other fish are in with it? I can see a bicolor angel. You know, that mark is almost identical to an open mouth bite mark from another fish. A friend of mine got bit by a bowfin and it left a mark lust like that, but much larger (grin).
Jay