I agree with jowens, my experience with grammodes, I had raised one in a 20 long gallon tank that would not do much in the tank, and I have raise one in a 300 gallon tank that was not shy, he would grab the pellet food as I feed it to him, although he was sharing the tank with other cichlids, so he would get the food as they would... Yes I believe that they are more outgoing when you have them in a large tank. Although as you all know, they are monsters when sharing the tank with other cichlids...