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Look at the fish's bottom side. If the "anal fin" is fan shaped the fish is a female, if the fin is thin and pointed like a nozzle then the fish is a male. In the male this fin is called a 'gonopodium'

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Q: How old are mollies before you can tell what sex they are it looks like their all girl because they have bottom fin but does it take time to tell what sex they are?
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