hey, i have 5 bp's and i have a 1.3 colony that just started producing. if you have the space and time i would definitely start breeding. it would save you in the long run but just remember that you would have to continue buying until the rats start producing. IMHO, with 6 bp's i would get a 1.6 or 2.6 colony and definitely build a rack get some mazuri and some pine. we feed ours a carrot daily and whatever fruits and vegies we have. almost forgot that you would need to clean the tubs out weekly otherwise the smell starts to get strong. there is a thead on here explaning on how many to breed and all that good stuff and i'm sure that the more experienced breeders will guide you in the right direction.

P.S. i will be picking up another female today.