sex these 3 fish

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Im thinking the one who managed to squeeze under the divider is female. Are they still together?
 
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they're not, I took the video then put her back. I can see where they've begun digging again. I'm guessing about a day or 2 she will have managed to dig under the divider again.

I really would like to figure out the sex of these 3 fish ASAP, so I can make my moves.
 
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still not sure on the sex of these fish. the "female" dug under the divider again and swam to the larger ones side. I put "her" back, now the larger one is on her side. The "female" gets pushed around a lot and ends up in a corner of the tank near the surface.
 
Male usually has longer and pointed anal fin, while female is shorter and sometime leaning toward roundish shape.
 
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