What i was going to do was this:
Get new snake in July
Quarantine for a month
Move into new apartment, and build a double tub rack, to house my Ball and my new snake (be it a new ball or a new BCI)
I know its IDEAL to have boas and pythons housed completely separately, but i'll only have one room to myself anyways (dunno what my roommates will think of having snakes in our living room)
So if things look good after quarantine then I think it shoudl be safe having them in different tubs on the same rack