They are actually ex-Cichlasoma Pearsei...previously Hericthys. They can get much bigger than 10"...and very high thick body. They do well with others, but are agro toward conspecifics. A wile back a friend shipped me fifty juveniles. I still have four. REALLY under rated CA cichlid. If you can find stock from Guatemala you will see more color than the fish originating from the Yucatan.