I'll have to use both because i can't run either of them for 24 hours. I'll have the heat lamp on for 12 hours and a heat mat on the back of the tank on for 12 hours at night. I have a baby ceratophrys ornata in a 10 gallon and i'm going to find something to divide the tank and keep a baby ceratophrys cranwelli on the other side and ill put the heat mat on the back of the tank.