I'm fairly certain they're Brasiliensis. It's possible that it's a different species, but they do resemble Brasiliensis to me.
As far as size goes, my male is twice the size of the female, and they are the same age. The males are much larger in this species. If you have one large fish, and two small fish, it's very likely you have one male and two females. The only thing I'm stuck on is the fact that your male doesn't show much of the irredescence that gives the fish the common name of Mother of Pearl cichlid. If you look at my profile I have some pics of my 6" male. I can tell you that our females look nearly identical.
As far as size goes, my male is twice the size of the female, and they are the same age. The males are much larger in this species. If you have one large fish, and two small fish, it's very likely you have one male and two females. The only thing I'm stuck on is the fact that your male doesn't show much of the irredescence that gives the fish the common name of Mother of Pearl cichlid. If you look at my profile I have some pics of my 6" male. I can tell you that our females look nearly identical.


