I have a sailfin tang that has been in my tank for quite some time. I came home this morning to find him almost motionless. I noticed this as quite odd, because normally when I come home, he's the first to greet me. He has since made his way to corner of the tank closest to me, where he will normally swim when I'm on the couch. I noticed that he has several small holes in his dorsal and tail fins and there is a large red spot below his left eye, between his mouth and gill. His gills are still moving and he seems to be happy still, just not moving. I'd really like to see him swimming again, but I'm not sure what I am suppose to do here :-/ Any thoughts?