Some questions and observations:

1. Are you measuring temperature just above the UTH on the tank side?
2. Do you have a thermostat controlling the UTH?
3. Are you measuring humidity?
4. What are you using to take your temperature measurements?
5. You should have identical hides - he may just not like the hide over the UTH and is choosing security over comfort.
6. A light at night is not required. If you do want a light, I find red to be better since they don't seem able to see that part of the light spectrum. But you really should be able to get the right temps with the UTH. Ambient temps of 73-75 are fine as long as the belly heat is 87-90°. It'll be a little warmer in the hide since the heat gets trapped some.


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