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[mcap]

In the back left, there is a thermistor hanging from a wire. The heating comes from a ceramic heat emitter above the top center near the front of the tank, along with a black heating pad that is stuck to the back wall at bottom right. There is also foam pressed against the entire back of the tank to help keep the heat in.

I have the thermostat set to 81 F with a 10 F degree night drop. It gets quite a bit warmer than that near the top front of the tank, but she would have to climb the door to reach that area.
Here is the new setup. The previous tank picture is pretty old.