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This a photo, albeit not that good, of some Hemichromis cristatus that I bought at the 2012 Extravaganza. They are about 1 1/2 to 2 inches in length. The anal and lower caudal on mine have a black band that yours don't seem to have.
Well the fact that they actually seem to be of Nigerian provenance is enlightening. They definitely do seem to represent cristatus as portrayed in Lamboj as well as my strain of 'cristatus' which Mike also possesses. The fish came from Jeff @ Aquatic Clarity. That canary yellow lateral stripe seems to be mostly diet dependent.
IMHO, the fish in my avatar is quite possibly the true cristatus but this is based on semi-educated guess work. I would love to see a pic of the original type specimens of cristatus.
Having spent the last few days searching Hemichromis cristatus , I'm not sure what mine are. I'm posting two more photos of my fish. From the plaque of eggs visible they are in spawning colouration. The black circular spot encircled in yellow located mid-body is not there but is a stripe. What I would like to know is if there are a population of Hemichromis cristatus or if they are possibly hybrids. I apologize in advance for the poor quality of my photos.