I think what he meant was that getting the ambient to where it needs to be will leave no gradient. No hot side or cool side. This will be because the 6in covers most of the bottom of the tub. So therefore whether on the hot end of the acceptable threshold or the cool, the snake has no where to go if it wants to regulate itself. Meaning the whole tub is one temperature. I live in new England and will never build a rack that is not enclosed because of the winter. The only way i would is if i moved into a facility.

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