I have my dubias in a 20 gallon storage tote with 2 of the large under tank heaters, one on each side, and I can't seem to keep my temperatures up I have a thermostat and checked it and its working just fine but my temps are constantly staying right around 80* even though the thermostat is set for 90*. I tried putting one heating pad on the bottom and one on the side and that was even worse, it was still at room temp after 12 hours. What am I missing here?? Both the UTH's work great and are nice and toasty warm and I have covered 95% of the screen :?