Just an update, y'all. Picked up a regular space heater for my room (so toasty). Ambient has been at 85, and surface temps have been 91 and 82. He is eating, or trying to as far as I can tell. He struck the f/t rat as usual, but is taking a little longer than usual to start eating. He's just dragging it around the tank, then moves his mouth forward more, then drags. I am a little concerned. I'm leaving him alone for 30 minutes then I'll be back in to check on him.