[Mark Denaro]

You may have a situation in which you’re actually seeing agression between females. Subdominant females will adopt male coloration as a means of decreasing their threat to the dominant female. Aggression between males is not unheard of in this species but most intraspecies aggression is between females. I’ve kept them quite successfully in groups and in pairs. To maximize their production I would keep a pair or a female with two or three males. Be sure that there are plenty of hiding places so that any fish getting picked on has a place to hide.
Mark