Natural Born Chaos
Favorite Answer
The cichlid on the left you're asking about, correct?
It looks like either a juvenile Melanochromis auratus (auratus cichlid) or a stressed, juvenile Pseudotropheus cyaneorhabdos.
It's very difficult to determine the gender, especially juveniles. The best way would be to have another male/female to compare the dorsal, tail and anal fins to. Whether or not they'll breed, I can't say for sure, but I'm pretty sure these two species cannot cross breed.