Mine did that this summer. She was being cared for by someone else who assumed she was eating roaches put into her tank. For a couple weeks after that she would bloat up every time she ate anything, and I really had to watch her. Try feeding small amounts for the next few weeks after waiting a few days like mikesfrogs suggested. Soak him about an hour or so after he eats for awhile. That might keep the bloating from getting too bad.