Young O tanganyikae( male 6")
Since they all come from one basal ancestor differences can be minimal, especially before reaching maturity. I can barely (i at all) tell them apart
Coptodon (Tilapia) zilli below
They are really nice looking fish especially when they are larger. My little guy is only 1.25 inches right now so it may take awhile for him to show but he eats really well. Thanks for digging up some info duanes!