What kind of thermostat are you using?
Also make sure the thermostat is on the outside of the tank and the probe from the acurite is on the inside of tank.
You do not want the probe from the thermostat in with the snake as the snake could pee on it, move it or water could spill. If any of these things happen it can cause a false temperature reading which means your UTH will jump up in temperature and possibly burn your snake.
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