I have the probe at the bottom of the tank under the bedding, my house cools down to 74 at night, during the day he is by a window so he gets natural light and heat that way. I have the rheostat set at the lowest setting it will go down to so i don't know of any way to get the temp lower on that side. Should I just not use the UTH and use the CHE lamp? I am trying to do everything that it says to do on here but it doesn't seem to want to work out!