Ok I got the Eco earth out so now I place the probe on the outside of the tank underneath the UTH ? Or in the tank where I had it over the UTH? I jus wanna make sure the glad doesn't get too cold if he roams around at night with paper towel being down I could take the tank upstairs and that might help the ambient temp a bit. And clean up with this Eco earth is a pain I think I am going to get aspen when I can jus keep using paper towels for now.