I have a related question--
I just moved my guy out of a 20-gal into a 40 because he was starting to get a bit cramped. He's got a basking lamp and a heating pad on one side, his water and hide on the other plus an ambient tropical lamp. He's been hesitant to explore, but when he does he tends to do a lot of face-rubbing against the edges of his tank. Is he stressed out? Will it calm down as the new tank starts to smell like him again? I think he's getting close to a shed, but nowhere near ready to lose the skin (his last shed was about a month ago). He hasn't been fed yet this week either, so I don't think it's jaw replacement. He's never been aggressive or defiant, he just seems... concerned.