Thanks Godzilla, SO I have the new tank setup, I have the UTH with the thermostat probe inbetween the UTH and glass underneath, and a thermometer probe under the papertowel substrate and it's almost right on 90F, so that's good. The ambient is about 75, but I'm going to insulate the sides and back which should help. One thing I'm wondering about: so she's been pretty stressed temperature-wise for a while, and she did poop last night which is awesome, but how do I know when I should try a dead rat? I'd hate to waste a rat if I defrost/heat it and she doesn't want to, or is that what I have to do; just try and see if she's ready?