i live in nh. the humidity is between 60-70% and i use a probe thermometer and the probe is under the wall of his hot house. i have 2 crystal tape thermometers in the middle and opposite side of tank. im purchasing anothr probe thermometer to calm my concerns lol. i think the 55 gallon is 2 big for him. im gunna find a nice peice of wood and divide it.. also im looken at another bp to fill the other side lol