I have a 10g tank setup for my juvie spider, and attached my thermostat probe to the bottom of the glass tank. The UTH is a Zoo Med, stuck to a glass picture frame, then that is underneath the tank.

My question is that the temps of the glass is beyond 96+ F, when I touch the glass it burns after a second or two. When I attached the probe to the inside of his hide, the temps are 87+ F, which is fine.

Is it ok to leave the bottom of the tank that hot? If he stayed above the substrate and not burrow, he wouldn't get burned. Or should I not risk it?

There is about a 2-3" layer of aspen above the glass.