How large is the fish? Festae can be difficult to sex if young. But s couple things. Shspe of the head. The black at the front of the dorsal. All say female.
What is it housed with?
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I've already asked the same question on the other forum, most people confirmed that the fish is a male festae. Its currently in a 110g tank together with a scat fish, 2 geophagus, meekii cichlid, and jack dempsey.
Good looking fish. I don't see the black on the dorsal fin that the others mentioned. I'd say male, but if you are really curious, vent it and take a picture.
Seems male to me. The black in the dorsal is not solid black in that first picture. The green/yellow extends up into the dorsal, if it was a female that whole front part would be solid black. I certainly could be wrong though!