Cant Get My Tank Warm

[Bogertophis]

^^this.. Both our BPs burrow down to the glass in the hides on both the cool and hot side heat mats. We keep the substrate kinda thin over the mats and thicker elsewhere. When we check the temps, we will move the substrate aside to test the glass temp, since they always end up straight on it anyway.

And a 40 gal tank has a LOT of air in it- so unless the room is kept about 75*, you're going to need supplemental (overhead) heating of some kind (besides the UTH) to achieve the temperatures your BP needs to live in this tank. You also might need a larger UTH, or more than one. Lot's of variables, so each set-up has to be adjusted for YOUR situation.