Hold up, hold up for a minute, I know the first thing would be to jump on the 40 gallon. However. She is very happy in it by all outward appearances, she is always exploring and playing, and she when she gets too hot, she goes to the cool side, same with the reverse. She doesn't seem to mind the large space, she's very outgoing, not timid. I do not have a thermostat, I cannot afford one until December 1st. I know very well that analog is inaccurate, I use a digital one.