04-21-2012, 02:05 PM
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Norm is 2-3 females per male because males can kill fish if there isn't enough females.
I had one male and one female, they've been ok but male was all over that female all the time and when she got pregnant he got annoied and that stress fish a lot. They're really vurneable and they need peace and quiet, not horny male all the time who think about sexing.
Anyway they didn't die cos my female chase him from time to time when he crossed the line but when I had swordtails female died after she made free swimmmers.
In bigger tank you shouldn't have a problem but if 6 males will chase one female she will die eventually.