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the general rule is one gallon per per fish per inch in size. now you could over stock your tank but you will need a lot of filteration. you could keep all females, but the beauty of a Swordtail is in the mail. my suggestion would be to get 1 male for every 3 three females.

Edit: if you wanna keep all females, you might as well go in for platys or mollys :)

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