Do you have a UTH (under tank heater)? If so it should be all you need for heat. Overhead lighting isn't necessary for these guys. 90 on the warm side and 75 on the cool side should work. As for leaving for a week, just feed him well before you go. A Week without food won't hurt them.

I have a leo and an AFT that are left alone for a week every year while I go to my nam vet reunion and have had no problems.

Quig