I have a thermostat on the heating lamp. I originally just wanted to use the UTH alone, but found that it was only keeping the tank at around 80-84 on the warm side. So I bought the heating lamp and thermostat to just supply enough heat to raise that side of the tank the extra 5-10 degrees. I think my issue is that the tank was near a window, so when it was warmer outside it was getting too warm in the tank. I have moved my tank away from windows and turned the thermostat on the heating lamp down a bit, so I will continue to monitor and see how those changes help. Thanks so much!! Still up for more advice on increasing the humidity. Different substrates? Things I can add to the tank?