Haha!
So had the Herpstat plugged in for a few hours. The top tub and middle tub are perfect...the bottom tub is 6-8 (even 15 in one tiny spot) degrees warmer than the other two (no snakes in the tub) in places. I'm going to go ahead and assume I need new heat tape? Odd that the bottom tub has a few hot sports and since one of those spots is 110 I'm not happy! I have to admit that I haven't been checking that tub for temp until today because no one lives in it so that problem could have been there for a while not just after the new thermostat.
Right now I have the probe in the slot on top, which is where the cord is attached to the heat tape, should I move the probe to the bottom tub slow away from the power source?