females will do that too but not as much as males.He's a boy, I think I saw something else because I can't see it now. I showed him a video of himself and he looked about to give the betta(himself lol) what for!
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If the fish has a white ovipositor, then it's a female. The ovipositor is not always visible but if you saw it once and it was white, then you have a female.