Here is another tank temp question. My BP tank is set up with the following: Glass Aquarium with one under tank heater on the warm side and a basking light on the warm side. The day time heat with the UTH & light ( 100 watt ) is around 90 degress on the warm side and the cool side is around 80. The problem is that night time it gets what I think is too cold. Last night the center of the tank tempature read 65 degrees. Is this too cold and what can I do to suppliment the heat for night times? She seems to like the cool side as she spends most of her day there and then moves to the warm side for night. Any help or comments would be great.