I agree, hard to say without a clear shot at the mask on that fish. I'm leaning away from Zaire as they rarely have that dusty look. Leaning towards a nice dark Burundi. Again, hard to say. What I can say is that it is a nice fish.
How big is the fish and as jam05pr asked, what f generation is it?
It looks like an immature male to me (of course venting would be definitive) and I'd guess him to be about five to six inches? He'd probably be a $50 to $70 fish in a pet store and maybe $35 in the hobby. Just a guess based on a lot of assumptions.
Hope that is helpful.