Hey There!
We have kept Leos and Ball Pythons in PVC's (PowerHouse Displays) before and used a solid strip of flexwatt across the back underside of the enclosure. With our balls we used 11" and the Leos we used 4", both need to be controlled by a thermostat as the heat tape can reach 120 degrees plus if unregulated.
Lighting is up to you, we do not keep out leos under UVB however many say you should. If you feel the need you can rig enclosed ballasts in the roof of your enclosure to provide lighting, we have our reptile rooms on a timer and the lighing from the rooms gives enough light inside of the PVC's.
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