Hi Guy's I was wondering if you could help me. I have a pleco in my 90ltr tank, I'm not sure on what breed he is or of how old as he is from the dental surgery I work in. I've had him myself for 9 months, he's been doing really well. I also have an angel fish and 9 tetras in the tank with him. But today I came home from work to find him lying on the bottom of the tank not really moving and he has a bulge on the top of his head just in front of his dorsal fin. Not only this but his eyes seem to have shrunk in his sockets. Is there anything I can do to the tank/him. Or does anyone know what is wrong woth him? All help would be much appriciated.