Yep - You just need one container. They do need heat to thrive and breed unlike crickets (although they too breed faster with heat) but you can keep any sized roaches together and they will continue to breed prolifically. B. dubia give live birth, and the adult females and males are readily distinguishable/sexually dimorphic.

In all honestly, I bred crickets for years and stopped as soon as I got my hands on roaches. Their just a hassle... they smell terrible, they make loads of noise, they jump, they need extra care in order to encourage breeding and well-being...their just a nuisance and take up twice the amount of space in rearing bins, feeding bins, breeding bins, incubation containers, yatta yatta.... Invest in roaches; Breed and be Freed! =) just be patient and let them become established. It is soooo worth the wait.