Nice pickup! If you are going to add more cichla, I would recommend adding more than one to spread out the aggression. With only two cichla, the dominant one very often kills the other.
Just took this photo of my kelberi. During the 16 days I had him he has grown about 1 inch already. I would say he is pushing 5.5 inches now. He loves hikari cichlid bio gold pellets.I can see the effects of it on his color.
This fish just keeps blossoming every week.
Amazing how he changed so much in so little time from day 1 to today.