The che is NOT for surface temps! That is dangerous and you could kill your snake at those temps. THE CHE IS ONLY FOR AMBIENT AIR TEMPS, which should be 78 on the cool side, and 84 tops on the hot side. Do you have the che heat controlled by a thermostat?
If you want to get a surface temp 90degree hot spot, use the under tank heater on a separate thermostat.
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