Morning! So I am setting up an extra tank (10gal) and I have a zoo med UTH (10-20g) and it registers at 97 degrees. I want it to be at 80-85. I tried a regular plug in light dimmer but at full power it only gives me 75 degrees, so I went and bought a zoo med rheostat and with that at the lowest setting it sits at 95 degrees. I hear those zilla temp control things are good but I don't really want to spend that amount of money for an extra tank. I've heard of using dimmers that you hard wire to the UTH but im scared that if I do that it will b the same issue and I'll have ruined the UTH.

Any ideas??