Original poster - girls flare and can be just as aggressive as males, some even build bubble nests.
Originally Posted by Tissien
You're both wrong, I'm sure I have girls ;) They're both have ovipositor and they are in one tank with male. I don't think so that 3 boys can be in one tank from almost half year and never fighting together :) But I admit this, their ovipositor is very hard to find, sometimes I have problem with this and I starting wonder did my girls start change their sex :P
Their flaring always finished like in the movie, they never fighting and running before Aimaru (male) :)
What you have are males, which are obvious by the length of the beards and ventrals and the dorsal fins - keep in mind bettas naturally do not fight to the death.. they fight until one swims off.
Young males, especially PK males (which you have), will have a fake ovi to "fool" other adult males as to not be attacked.
Another question is why do you have 2 "females" with a male in the same tank? It's only been a few months, but count your stars lucky and I would separate them soon... what size tank is it? They really should not be together.. stressful to the fish as they can't relax, will shorten their lives along with make them susceptible to outbreaks such as ich from the stress.. the whole video they are posturing, which shows they aren't comfortable or feel safe in their home.
Female fish, both non PK and PK... can see the difference between yours and an actual female betta: