My BGK is 10-12" at the moment,grew him from a tiny baby.Hes in a well filtered 55 Gal tank (will be upgraded) with a Parrot,breeding pair of Thorichtys ellioti,large albino senegal,channa "assam",5" Dat polota,and 4 big clown loach.He rules his end of the tank,but with no aggression.Feeds well...