The question still remains. Why do you want to breed hybrids? When I first started with roaches I had fuscaXcraniifer hybrids that were nearly the size of B. giganteus and bred like wildfire. However they all molted poorly and lived half as long as pure stock. These are basically what Europeans call Blaberus craniifer, which is a terrible misidentification that forces its way into all aspects of the hobby.