My setup is practically identical to the 20 gallon setup sticky thread. I have an Acu-Rite in there, plus a small digital thermometer with the probe about a half inch or so above the substrate along the tank wall. I have the foil on top. Tonight I added a layer of damp moss around the water bowl, center tank and in the warm hide. Temps have been holding good and humidity has stayed at 60% for several hours now. He actually came out of his hide and has been active for about an hour or so now.