Heat tape does little to effect the air temp inside any type of enclosure, including tubs and racks systems. If your house drops that low, I would suggest you use a radiant type heater to keep to keep your snake room at a higher temp.
I use a different thermostat for each rack, which in my case, is four tubs. You can string together multiple tubs on one strip of heat tape, or even multiple strips as long as they all pull the same wattage.
I have been successful at keeping Ball Pythons from 150 grams up thru adulthood in the same 32 qt tubs. I do clutter the tubs up with extra hides when the snakes are small, and so far, have never had feeding problems.
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