I have a digital hydrometer/thermometer combo that I picked up online. I'm checking temps in the morning when I wake up and in the afternoon when I return from work. The house has been getting rather cold (as it does in the winter), so at night the temps in the tank usually drop to around 80 degrees on the hot side but I was told that was fine?

In the summer he was very active, especially around feeding time, but there's something almost frantic about his restlessness now and he's not eating. I wish I knew what was stressing him out so badly! He's never gone off feed with me before, though his previous owner said that he had a 4 month fast a few years ago during the winter.