I would say it is definitely an Aulonocara stuartgranti of some sort. Due to the fact that it came out of a mixed tank, you will likely never be able to nail down exactly which location of the lake its predecessors came from. He's still a good looking fish.
How long is he? I know in some of the pics, the body almost looks too shallow for a peacock, but if he is still fairly young, that could explain it.
How long is he? I know in some of the pics, the body almost looks too shallow for a peacock, but if he is still fairly young, that could explain it.