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In the first pic from two posts before this one, in reference to the festae on the right, the vertical bars seem to go up into the dorsal fin which suggests male. But if you look at the lack of spangles on the tail fin of this same fish, they seem to be dwindling down which is suggestive to being female.
In my opinion, from what I have seen happen, the spangles start to dwindle off before the female dorsal blotch shows. So if I had to guess I would say this one is female, however it is still to young to know for certain.
I once traded a female festae for what I thought was a male festae of the same size. This guy (or girl i should say) was bullying a lot of the similar sized cichlids in the tank, and was probably somewhere in the middle when it came to pecking order because there were fish twice its size as well. Anyways, this festae was bright yellow and still had some decent amount of spangles with the vertical bars going into the dorsal with no blotch. I took this guy home and within 3 months proceeded to watch him darken to a deep red, lose nearly every single spangle, and lastly develop the female dorsal blotch. It was like watching a sex change unfold before my very eyes, which was disappointing because i already had 3 females (not including the one i traded for).
With all this being said, you seem to have some nice quality festae on your hands. The original female you have has nice coloration and a nice body profile (a nice smooth muzzle with a full body). You will LOVE this fish even more when u see her light up in the presence of a male. And the other group you have doesnt have much color yet but they will, and they also have a nice body profile as well.
You're well on your way to a nice pair of festae IMO. If you are worried about the size difference between your future male and present female, consider using a divider in the females tank to allow the male to grow without her harassing him. My female was 6 inches when I divided a 4 inch male from her. After about 6 months (maybe even a little sooner) the male was an inch bigger than the female.
Good luck and keep us updated, i really like lengthy growth threads like this 1!