Ok... I bought a new heating pad that stays on instead of shutting off after an hour, and it's all set up. I'm using a glass tank for my BP, and the glass is about 90 degrees, but the substrate isn't even 80 degrees... it's about 78, and it's on the highest setting. I've taken a lot of the substrate out so there's as little as there can be without exposing the glass at all, and it's still not even 80 degrees. I have 1/2 inch boards underneath each side of the tank so there's a small gap between the pad and the glass. Do I need to change substrates or what?