I moved the tank yesterday to a different room, and it went up 5 degrees. So they are at 70 in the afternoon, and as of now, 10.35 on the last day of 2007, the tank is 67 degrees. I know that is kind of cold so I am probably going to put a space heater in there for say... 2 hours at night to warm up the substrate for the night. I saw Matt has this pad heater he puts under the tank so I will see where I can buy one of those but first I will ask him how it works, (well or not well) and lastly, I think it might work, but I have this kind of crazy idea. You know those hand warmers? What if the tank goes below like 55 degrees? I crack one of those and the tank SOARS to 90's. But obviously I would take the warmer out before the tank reached 80.