I only pick up my guy when he's out and wandering about in the evenings, I try not to go into his hide or disturb him if he's in there. He's also only ever snapped at me once, after I'd moved him into a new tank and he didn't want to leave his old hide for the warm spot and was a little cranky. I was well out of striking distance, but I've been leaving him alone until he feels nice and settled in to his new place. Does your guy come out and cruise around and explore in the evenings or bask?