Good Sunday morning!!!
How thick is your substrate? For a uht to be effective. It should be no more than 1/2". Perhaps center the heat lamp on top instead of just one side since there is more area to heat, what watt bulbs are you using? That is a large tank to heat. Perhaps you will need two lamps to get the temps you want/need.
p.s. pics always help. And ya might wanna make sure an ac vent isn't blowing right onto the tank.
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