Ball pythons temps need to be a little higher than a Bci and higher still than a Bcc and so you'd need to find the coolest tub in the rack and check the gradient.

It is a good action to qt boas for several months since they can be asymptomatic carriers of IBD which can kill your ball pythons in a period of weeks.

I have my boas in the other end of my home than where I keep the ball pythons and will continue to do so. However, were I to keep them in the same room, I would qt for 6 months.

Also, I can't imagine a boa being able to fit in a tub sized for a ball python for very long.... Just a thought though