Okay, this may not be the response you're looking for, and this might sound offensive in a way, but I mean this sincerely with good will: If you want to keep your snake in a terrarium, always make sure that the humidity is okay where you live (where I live, it's around 55-60% which is perfect), and you have space, since those are the problems you have. But to answer your question, a 41qt tub should be more than enough for your BPs, though I personally prefer terrariums.

Sent from my vivo 1601 using Tapatalk