personally not sure what you are referring to. Viv= Vivarium? = Cage?
Royal = Royal Ball Python = BP?

If I have that right, then I will say, I plan on keeping breeders in Tub not VIV. The VIV I have now will be reserved for my "pet".
As far as breeding, my females will all be in tubs since it is easier to make sure nothing foreign gets introduced to breeders and it is the most stable.

Hope that is what you were asking, if not, disregard. =)