right now i am using a ceramic heater, on top of the cage. i do have an undertank heater too, but never plugged it in because i thought my temps were right. he is in a 40 gallon aquarium with vents in the side for air, has hides on the cool and the warm side, along with some branches to climb on (and cuz they look cool) and 2 water dishes. using reptibark for substrate