This is from Rapps
Sexing Cichlasoma festae
Ok this is just a short little article to help anybody out that's having trouble sexing there Festaes, and also because i love writing articles about this awesome fish. Firstly i wanted to add that this particular species of Cichlid isn't like most other cichlids in the way that the Female is normally a lot more colourfull than the male. But the main differences between male and female Festae is the black/blue markings on there dorsal and pelvic fins, there is also the matter of the blue spangling dots on the males fins and tail end of his body. Though there is some confusion in using this particular trait in sexing males as in some festae populations females may also obtain the blue spangling though it is normally to a much lesser degree. Anyway here are some pictures, unfortunately there aren't to many photos of male Festaes on the net as like i mentioned before the females are much more colourfull and hence create much nicer pictures. This isn't however to say male Festaes are ugly or dull, it's just the Red colour isn't as intense as in the Female.