Yes, he was just eating too much. the other day i put the food in slower so that none of it would get to the catfish, and later that day I noticed it's belly was back to normal.
I'm glad to hear that he's doing better. Also on a good note, I finally got my 55 and have got it all set up and whatnot... it will be ready for my fish soon. Then I'll finally see my pictus get big and fat.