Well, I mean it is in that range, closer to the 90, I just gave you a range that it stays in. The ambient temps are mostly an estimate based on the room temp the tank is in. I use a UTH with a thermostat to regulate the heat. He's only been soak once in the past /month/ I really don't think that's the main problem. The temps are in the range they should be. I don't think that is the problem. He's never had any problems before and his tank's always been like this.