I got this guy today. He is at least 10" and was in a 29 gallon tank by himself. His gill plate is basically missing a good chunk on the other side and his gills are exposed so I will most likely house him alone. He is currently in with a pair of Copadichromis Borleyi and the 3 seem to get along just fine. The 3 are in a 75 gallon tank. There was a pair of Freddies in with them also but the male looked like he wasn't going to like the Oscar so the pair moved to their own tank.