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Since they are pretty much impossible to sex when very young, you buy extra small fish and grow them out together and any real troublemaker males find a new home until you hit a peaceful balance.

Here is a calculator for picking your odds.

Probability of success on a single trial: 0.5 (50% it is a Female)
Number of trials: 8 (try buying 8 juvies)
Number of successes (x): 4 (I want 4 girls)

Cumulative Probability: P(X > 4): 0.63671875 almost 2 chances in 3 that I get 4 or more girls.

I up the buying to 10 and my odds go to 0.828125, better than 4 out of 5 that I get the 4 girls.

Hope this helps.
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