I had two pair in a tank and both the females had eggs. The dominant male was taking care of both them not letting the other male go near his own eggs. It was quit strange. So, feeling bad for him getting beat up all the time, I took him out and put him in another tank. The other male continued to try to breed and be a pair with both females. Being a female myself, I couldn't watch this any longer. So, I took the other female out and put it in the other tank with her first male and they had babies awhile back. My bossy two-timer male still hasn't been able to get his eggs to hatch and grow. The moral of this story.... I have no idea,,,,,just thought I would share....