From my own experience, As long as you keep their hot side at the correct temp. the enclosure will cause its own gradient. The snake will be able to get to whatever temp is comfortable for it. I personally keep hot side or the backend of my tubs right about 90 degs on the substrate. I've never had an issue with feeds or sheds. The only time i have ever had issues with temps is when i screwed up and didnt wire my heat tape correctly.
This is just my own experience. My living space is usually around 72 deg. Everyone has their own way of things.
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