Quote Originally Posted by beandog View Post
Oh okay, that makes more sense now. So there's two temperatures to watch for: the ambient temperature of the air, and then the temperature at the base with the substrate.

To answer your question, the thermostat is on the left side of the tank (sorry, I need newer pictures) and is sitting right on top of the substrate. That's what is measuring at 90 degrees.

And yah, I put my hand on the UTH and it's definitely hot. I imagine things will make a lot more sense once I put the UTH actually under the tank.

I'm still confused though as to what parts need to be what temperatures though. Is it the ambient temperature that needs to be 90/80 on both sides or is it the temperature from the floor of the tank?
I'm a bit confused. Thermostats don't measure the temps, they regulate them. Also, how is your probe secured? If its just sitting on top of the substrate, your snake could easily move it, which would be the same result as having your UTH unregulated.