There is a way to do it, but the safest way would be to use a separate T-stat for the tub since your enclosures are all different types, sizes,and materials. Piggy backing one off of another might mean having to make adjustments to the one with a snake already living in it. It is easier to do when you are using 2 identical enclosures. Same size, same heating sources, same type and thickness substrate, etc...
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