Paracyprichromis Nigripinnis

Nice fish. If you are going to try and breed them, I'd get two males and 3-4 females, however, and give them their own tank. I have to believe that they spawn like Cyprichromis leptosoma (i.e. open water, no fixed pairs), and the males will show their colors better displaying against each other, too.
 
AquariaCentral.com