Aspen isn't good for humidity, your humidity will probably be too low if you use it in your tank. I use cypress mulch and eco earth, both are better for keeping humidity than Aspen.
You don't need to move to feed, and you shouldn't be messing with him until he takes a couple meals with you. Leave him alone for a week and feed him what they fed him at the place you got him.
He has a hide on the hot and cold side of his tank right? You want two identical hides in a tank so he doesn't choose security over thermoregulation. I'd black out the sides of your tank with some poster board or construction paper to help him feel secure, just make sure there isn't any tape on the inside of your enclosure.