Yes I had swordtails. There were two males and 4 females. It was primarily one male and a two females that were being aggressive and after losing two of the other females I decided it would be best to take them back. I don't want to have a stressful situation going on for the fish due to the small aquarium size. After seeing an adult swordtail in the store they would have really limited my choice of fish so it all worked in the end.