I just recently purchased a 50 gallon tank (it's 4ft long), a 30-40 gallon UTH, an 85 watt green light for warmth, and a large water bowel to help with humidity. I had her in a 20 gallon tank with a 20 gallon UTH and a 60 watt light bulb. I had problems keeping that warm enough for her. I was wondering if i should put the smaller UTH under the water dish on the other side of the tank from the larger UTH where her hide is. I also purchased two electronic thermometers that read both temp and humidity (one for the hot and cold side) I was wondering if any one had any suggestions on how I should set up my tank and what I should turn off or on at what times (I purchased a timer which multiple things can be plugged into for this) The average temp at night in my house is around 70 F (I can't get it warmer, I've been trying) and durring the day it can get to around 75 F. Please give me some suggestions, I'm new at this.