Quote Originally Posted by JLC
It sounds alright to me....so long as your cool side temps aren't going too low. If the surface of the glass is 91 on the warm spot, and the layer of substrate is just a thin one, then it should be fine. If the snake wants more warmth, it'll nestle down against the glass.
It's fine. If, as you say, it's a thin layer of substrate...the snake can reach the warmth it needs. Also...are you measuring the temps under the warmside hide? It's usually much toastier in there than outside the hide.