I have not had this happen I have interduced a new male to two non producing females that were in a 1.4 group. To interduced the new male I took the 2 females out of the 1st group a day before bring in the new male put him in the enclosure first and waited about an hour before putting the females in with him. I belive if you put the females in first and their is none of the males sent allready there that is when the attacks happen. But I am not sure. Maybe Mike will chime in he knows the ASF's better than I do.