i currently use 15qt tubs for my bps that are at that size. I think 32qt is way too big unless you are going to clutter that thing like crazy. I find that 15qt allows you to put in a hide and water bowl and still allows the snake to move around more than sufficiently. I have 13 snakes currently in this setup ranging from 84 grams to 400grams. i will be removing the hides for the bigger animals when i get my rack setup so that will give them even more room (the rack is enclosed on the sides and back and it is recessed so the snakes will have plenty of dark to feel secure. As for the holes i just put about 10 holes on both sides of the tub with a soldering iron. That seems to keep the humidity for me at a perfect level. If you find that there are too many holes you can cover some with clear mailing tape to adjust.
As far as humidity goes i go around 60-70% for the norm and up it to around 80% during shed. No problems there for me.
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