The probe for the hygrometer should be placed on the back center wall of the tank - check it there - you dont want it going below 20% -- are you getting ambient temps? The probe should be placed on the spot where he basks to get surface basking temps - doesnt need to stay there but checked every so often as bulbs do loose their intensityI took out the rice sock. It's at 22% where he's at. I can up his heat with a 100 Watt bulb. I've been using a 75 watt because he does get very hot in there. I was using the 75 watt because he became overheated once and that was when he was lying on his box.