We have a 25gallon tank with a wire lid. We currently have a heater under the tank on one side and a heat light over top. We have a thermometer and a hygrometer in the middle of the tank. We have a granite water dish which we have over the heat pad and on fhe hot side of the tank. He has rock cave on the other side of the tank. I have read somewhere about using sphagmum moss......should we be using that too?