A little scare

[ConcinusMan]

I've found that the mats work best with as little substrate as possible and a 5mm gap between the mat and the bottom of the tub.

Same here. I never stick them on the glass. I elevate the tank enough so that it will slide under and still have a gap. Otherwise the dang things get too hot.

I never have to worry about that using my hydrofarm seedling heat mat though. It's always the perfect temperature even if I set the tank right on it. Dang reptile heat mats just get too darn hot.