Okay guys i just got a new uth mat , i dont have it directly touching the glass of the bottom of the tank because i dont want the glass to get hot enough to burn her . Instead its resting on the surface of what her tank is sitting on, therefore her tank is about 1/4-1/2 inch above it and the heat should be trapped in there . My question tho is , about how long should it take to heat her tank up ? Its a 7w matt and a 10 gallon tank (shes still a baby) . So far it doesnt seem like its adding to her heat at all and its been slightly over an hr