Hello everyone. I'm going to be getting my first snake either today or within the next couple days but I have some questions regarding the temp. The snake is a rosy boa, the tank is a 20g long with aspen bedding, a hide and under tank heater. Inside the hide which is on top of the heater the temp. reads 90F but the temp. elsewhere in the tank is about 70F. Is this alright? I've read that these snakes don't need lights and would prefer to use the under tank heater only but unless the snake is on top of the heated portion of the tank it seems like the rest of the enclosure is too cool. Any thoughts?