Be forewarned that an adult incei MF will prey on any adult males! :ohmy:
My communal consisted of 6 specimens. It turned out that all of them were from the same egg-sac, needless to say they all moulted into adults at about the same time. When I noticed this I separated them, keeping the MF's together with one MM. They were all well fed prior to mating. The MM was roaming the enclosure and met his match soon after. Another thing I noticed is that the MM's doesn't touch any of the roaches / crickets fed to them!