If you can, spray the new enclosure bedding w/the Provent A Mite, before you move him, so when you DO move him to his new tank, you're already starting to get rid of the nasty little bloodsuckers.

Wait a week for him to settle into his new home, before trying to feed him. It shouldn't hurt him to wait and he'll be less stressed from having been moved, and the new smells and textures of the new home, and less likely to refuse a meal.