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I had 5 females and 3 males.
The males killed eachother til there was one. He got the females pregnant, then they killed him. Then the females killd eachother... I now have 1 female swordtail... whos pregnant.
I have 3 females and one male. He must be happy, all three girls are prego, 2 are ready to drop any day. I have heard that based on tank size only a couple of males should be kept per 3-5 females.