Hissers can get the mass which is good, but frankly I think you would get much faster production with one of the Blaberus species for a large feeder roach. Blaberus discoidalis and Blaberus atropos seem to reproduce the best.Thanks for the advice,but i acquired about 7 hissers for the great price of free over the weekend.So i guess That's what i will be working with.Jason.