Okay im using repti bark as a substrate and i currently have my heating pad set at 100 degrees so that its about mid 80's if that on the top of the substrate .....just from searching on the web I have been reading 100's is not enough to burn your snake ....that is he burrows down to the glass .....i think im going to leave the pad set at 100 degrees and have the heat bulb on aswell just over his hide and the heat bulb will help in my ambient air temps in the tank .