Thanks for the advice guys! I decided to get a more accurate reading of the ambient air temperatures of where he is actually spending most of his time (hot side hide), so I pulled up my thermometers probe and put it at the top of his hide and the ambient temperature was 79.3. I'm definitely going to take your advice by getting another UTH with a dimmer and using that on the cool side. Hopefully that will solve the problem and up the rest of the tubs air temp. If it doesn't work, do you think it would be a good idea to just go out and buy a new tub and put less holes in the top/no holes at all in order to trap the rising heat (just have holes on the side)?