K, does this mean I need to change the temp of my FBT? I keep at the recommended temps, but like I said, at night, (in Denver) the temps are going to lower no matter what. I donít want them stressed or unhappy. Should I at an under-tank heater to the water side of the tank to heat it up? Right now I have 2 heat lamps, one night lamp one day lamp on timers to switch so there is always heat in there. I have an extra under tank heater, I was just worried if I added it, it may be too warm? What do you guys think?