I am trying to set up a 55 gallon tank for my BP. I have a large UTH on one side and a 150 watt heat lamp on the other, but still can't get the temperature above 73 under the lamp. There are 3 thermometers in there, one on each side and one in the middle. The is a screen top on it, so that could be contributing to the problem. I am somewhat new to this, and I just can't figure out what else to do.