Yea, there's a whole in the wall in my garage that leads to the snake/fish room, so probably a draft, will need to close it up. I guess if need be I could also just put a space heater in that room to keep the room temp constant. I just read the UTH should be 1/3 the tank? Since the 40 gallon breeder has more floor space than a standard 40 gallon, the medium isn't quite covering 1/3.

P.S. I also think too much haha