I kept my two tomato frogs in my living room and the thermostat read 73.4F so I thought everything was ideal, and they were doing well. But I tested my therm in hot water yesterday and it didn't move at all. So I tried another I had and it jumped up (in the hot water) to 104.5f. So I put the working therm into the tank and it was 65f. Its early winter and chilly where I live right now. So I'm wondering if I should get a heat lamp with a 50w and keep it on very low so the temp stays around 73-75f.