Thanks Johnny-very informative. I have not set up the undertank heater as of yet. I have their home on top of my tv stand, and the overhead light alone seems to be keeping their temperature in the right range-84 degrees or so. I even had to turn off the overhead as it heated it up a little too much. They have slept pretty much all day. I did not realize they needed a basking area-I will have to look into setting up such an area for them. I will return the heating pad for a refund and invest in a very cool skull feeding dish I found....perfect for upcoming Hallowe'en!