Since you already have two UTH's, I would say get a Hydrofarm for each. Set your cool side for 80 and the warm side for about 92-93. Next, insulate the tank. You can use anything like cardboard, polystyrene, styrofoam, or foam core board. I personally like the foam core board because you can get it in different colors. It's available at places like Wal-Mart and Target in the school supplies section next to the poster board. Cut three pieces to fit and tape them to each end and the back. Next, remove the lamp. Cut a piece of whatever you use so that it's the same width as the screen and maybe 1-2 inches shorter in legnth. Wrap this piece in aluminum foil and place it on top so that there is a small opening on each end for ventilation. This should help hold in both heat and humidity. Also, if you are using any wood type substrate, make sure you only have somewhere between 1/2"- 1" thick layer. If this doesn't help and you still need the lamp, just adjust the length of the top panel to accomodate the lamp, making sure that there is about 1" between the panel and lamp...