Just a few questions

[hilabeans]

It's a 20 gallon high and the basking spot is 97-99. The temperature on the warm side is 89-81. And on the ambient side it 77-81. My little guy is thriving on just a heat lamp. It doesn't fluctuate like a an UTH so I don't need a thermostat.

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Your temps are way too high. 78º-80º cool side, 88º-90º hot side - ALL HEAT SOURCES REGULATED BY A THERMOSTAT. This can not be overstated. Unregulated heat sources, whether lamps or mats, are a recipe for a (neurologically) cooked snake.