I have pure bernhardti, and what are supposedly real petiveriana as well. Waiting for the latter to establish still, getting babies from the bernhardti now though so those will be available soonish.
Yeah they eventually started hatching, think it was just taking so long because I was keeping them in the 70s. Once you bump the temps up to the mid 80s it takes like 4-5 months for hatching.
Yeah if you have 50-100 in there already that's as many as an enclosure that size is ever gonna hold. You'll want to give them a bigger, wider enclosure with more substrate/surface area if you want a larger population.