Yeah, belongs in African Riverine.
I LOOOOOVE Oreochromines and Mozzies are definitely up there among my all time favorite cichlids.
Their range of color is pretty awesome, from a pale silvery color to jet black with white cheeks and blood-red outlined fins and a pretty blue/green iridescent striated pattern on the body for males and several in-betweens and even females can pull off the silver-black changes in certain situations! I love the physical dimorphism between the sexes and developmental techniques they adopt to help them get by with others of their own kind.
Very active, eat anything, can live just about anywhere, will spawn in a toilet, strong personalities once you get to know them, zealous lovers, brutal fighters and (dare I say) even cunning - just about the most entertaining thing for me is to watch a 3" mozzy bluff his way out of a fight with an 8" devil just by opening his gaping mouth and showing him how easily that devil's head can fit in there.
They're not most people's cup of tea for the fact that people themselves have made them pests in other countries and many of the Oreochromis sp. are displacing native and endemic species, but they are a testament to the resilience of some fish and incredible in that right. They are under-appreciated IMO and deserve far more respect for being one of the ultimate examples of adaptability in cichlids.