As stated, it's always good to be safe. Quarantine ANY new snake for at least 30-60 days and know your breeder. Do your research. As far as housing them in the same rack/room, some will say it's ok...some won't. If you get a snake from a show (which is a great place to "shop around" and buy at), just make sure you treat the enclosure for mites. Just because the person you buy off doesn't have mites, doesn't mean you won't bring a few home from someone else's table. It ALWAYS pays to be safe. I keep most of my male boas in a cb-70 rack, which is only a 30qt I believe. They are more perfectly fine in there too. I have a couple that are in 321D's too.