Quote Originally Posted by sidhe
I finally got my tub set-up just about right but, I was wondering about the temp on the cool sides. I use an Accurite digital for warm and cool side readings (i.e. placed in the tub) so do I want the floor temps (belly temps) or ambient temps at 82-85?
Thanks
Yes.

You want ground temps to be 82-84 cool side and 92-94 warm side. Ambient air temps should be pretty close to that. With tubs it's a pretty mute point anyway, as there is little difference between floor and ambient temps. It becomes more of an issue in larger tanks. I hope that helped.