I have seven 9 month old Sword tails all from the same birth. I thought they were a

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I thought they were all female. But two developed swords in the past month
 
Many swords can be late bloomers or some even change sex when needed.
Looks like yours are close to wild so who knows what they are doing ..But you got males now too.
 
Yup, now I have a total of three males including Dad and five females. Everyone seems to get along.
 
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