They are a little on the young side. Though I did have a female breed at this size (2"), she had a full mouth with just 1 fry. Jawlocking is usually a dominance fight, so its likely you have at least two males. I never see females jaw lock with males in this fish, but it prob. means your males are mature. I was told the lower front fins being black mean the fish was male, but I've been told its not 100% accurate. You might be unlucky and have all males, or your female(s) are too small, or they bred and you missed it and she spit the eggs. Does your tank have lots of hiding places? Rocks and PVC pipe are good.
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