It could just be the typical BP "I'm well fed so I'm just going to stop eating for a couple months" situation. My female pastel went on strike, just ignoring any f/t I gave her (didn't try live as I've never fed live and wasn't comfortable getting a med. rat and letting her go at it). After about 6 months of no weight loss, but no interest, she just decided one day that she was hungry again. As long as he's not losing weight I wouldn't fret about it