Thanks for your reply. So I am using a temp gun to measure the surface temp of anywhere I want to measure and for my thermostats probe, it is under the substrate on top of the glass above the UTH. I have a digital thermometer/ hygrometer with the hygrometer probe set on the back side of the tank in the middle and the temperature probe under substrate of his cool hide cause its hard to measure the temperature in there. I had a higher watt bulb in but it was sucking the humidity out and making everything too hot. So i went from 100 to 75.

I feel like my heat mat isn't working correctly or something because It doesn't get the substrate anywhere near 90 degrees. I don't know what to do with it. I took Udon out of the enclosure so I could test the temperature and I could crank the thermostat to 120 and it still wouldn't get to the right temperature underneath his hot hide.