Don't put the heat pad under the tank!!! Your frog may burrow into the substrate right down to the bottom and get burn that way. Heat pad can get really hot on the bottom, so becareful. Instead you can use a 25 watt bulb for supplemental heat along with the heatpad you have now. It works great. Just make sure to check the substrate often to see if it dries out and mist your frog often. Hope this help!