The OP listed four fish and wanted to know if any of these would go with a Rift Lake tank (if I understood the questions on his original post). he listed four fish, including salvini and rainbowfish. None are combatable in an African tank IMHO. I don't mix old and new world cichlids and when doing an African tank (my experience is male peacock/hap tank and Vic tanks), I use only fish from one lake (with the notable exception of synos).
Just my way of doing it, and thus my opinion. He did say one species. Labs are a colorful and interesting single species that would do fine in the tank he's considering. The addition of a single colorful male peacock was just an idea that the OP is certainly free to ignore!