Hi Suzy.
Sounds like you've done some homework. Most people find tubs easier to maintain proper heat and humidity than tanks. The size of the holes is not quite as important as how many and where they are. Start with a few on each end of the tub. Put the warm side holes higher up the tub than the cool side holes and have a few more holes on the warm end than the cool end. Set everything up before you get the snake. Once you have some readings it will be pretty obvious what you need to do next.
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