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It looks like a female (no colors and round belly), but it seems to have a gonopodium organ, a dot on the tail-fin that other females lack and the gravid spots near its vent are fainter and higher up than other females. Males occasionally display in front of it but they chase after it less than after other females.

Here's another picture:
enter image description here

lila
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matthias_buehlmann
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1 Answers1

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The best way to discern male from female is by looking carefully for that gonopodium you spotted. That is a male sex organ and you'll not find it on a female. In short, that is a male fish. Late reply, I know. Hopefully he's still happily living in your tank and this helps somewhat.

Blake Cass
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