It seems like female CA cichlids lay eggs once they have come into sexual maturity. They will defend them as they were fertilized.
Oh my god cichlidfish I think you may have solved it perhaps...
http://www.aqvaterra.com/imagenes/cichlids/gymnogeophagus_r_catalan4.jpg
compare that with
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i like the tank,your close up shots of fish look great,very unique group.an idea for you-cut pieces of black PVC to slide heaters into,they will be less noticeable
Well I hope I have helped. You could maybe email or call Jeff for a confirmation. He's a really nice and knowledgable guy.
You could also try the American cichlid association or the cichlid room companion for a positive ID.