That fish you have could be a few different types of possible Aulonocara ,, it could even be a throw back from hybridized peacocks like dragon bloods or marble peacocks.
Then again it could be a Aulonocara benga pure,, but there's no telling, so never id a fish like this to add to a colony to breed without complete confirmation of purity.
But if your wanting to know for common knowledge,, then it's a Aulonocara specie, looking in the realms of being a (benga).
Looks nice and healthy there to,, good job,, just remember as a fish slows in growth and becomes bigger, the amount of food they need in ratio to body size is much less,,,,,, as the food isn't needed as much when there's no growing to be done,, and your water quality will stay much better for it,,, Well done and good luck,, hope to see you in future updating on here again.
- Poncho likes this