First of all, what are the dimensions of the tank? the dimensions of the Under Tank Heater? What type of thermometers are you using? I also recommend looking into getting a thermostat to run the UTH, and a rheostat or dimmer for the lamp.

Here are a couple of threads that might help in the meantime...

http://ball-pythons.net/forums/showt...p-w-pics-*DUW*

http://ball-pythons.net/forums/showt...tment-Tutorial

http://ball-pythons.net/forums/showt...t-Instructions