heated with UTH w/thermostat. i have the thermostat set for 88 degrees, but the probe on the inside measures from 88-90. he has the little tree stump hides, theyre really small. he's nice and snug in there, although he may be outgrowing it. i'll cover the sides and see how that works. as far as feeding him again though, i feed him every week but he's rejecting every other week like clockwork, and i read you should wait 7 days to offer again. so if i offer again should i go with a smaller size mouseif i'm going to offer that often? none of the LPS sell rats small enough for him, frozen or live. and all i can get is f/t mice.