Hello everyone. I have a leopard gecko in a 20 gallon long tank. I currently have a heating pad on one side of the tank and have a digital thermometer and have measured all areas of the tank. On the heating pad it is getting to the upper 90s and I am worried that this is too high.. but the air temp of the rest of the tank at night is in the upper 60s which I worry is too cold. What is the best way to balance this gradient out? Get a thermostat for the heating pad and add a ceramic heat emitter for the top of the middle of the tank? Any other ideas or opinions? Thanks a lot whoever helps.