A number of years ago while growing them out I had one male (roughly 11" or so) spawn with two females (about 6") at the same time and completely ignore the third remaining female. Both spawns where laid under two feet apart in the aquarium and without too much anthropomorphism there was an uneasy understanding between the two females. Fry were allowed to gather at whichever site they chose (often one female would have almost all of them and later in the day the clutches would be heavier congregated with the second female) neither female would actually cause harm to the other while this was happening just a lot of posturing and threat displays if one ventured a little too close to the "wrong" side of the stump but no physical contact. Before and after the spawning the "agreement" was off and each kept to their respective ends of the aquarium for the most part and when this failed to be the case the usual liplocking ensued. I chose to remove the fry at the 7-8 week mark as with the sheer number they were beginning to make the parents look tattered.