buy a can of PAM (Prevent-A-Mite) and treat all the enclosures. Don't worry about his stuck shed just yet. You could be added more stress than doing him any good. With all of the rescues, start out feeding them small meals less often and slowly work up to larger meals more often. You don't want to shock their digestive system with all the changes. Once he's eating for you and you have the mites cleared up, then work on his stuck shed.