Thanks for the feedback. It does look like a burn...but I have no heating element in the tank. The only thing that I could have possible stung it would be anemones...but very doubtful as I've never seen it around them to speak of. I've never seen anything picking at it either. I noticed labored breathing a couple of days ago...then it stopped eating...then yesterday I noticed this spot. Makes me think it's some type of infection. I only had it a month. It died last night. Are blennys prone to infection? Should I get another one? Thanks.