I had what I would consider, a CHAMPION Grammode. He was a little skiddish at first until I got a regular feeding schedule associated with me turning on the light. After about a week and a half, when the light came on, he was at the top of the tank. After that he was extremely aggressive at three inches. He grew to about 8in. He killed, better yet crucified a 12in arrowana in about three hours. I put the net and my hand in to try to stop him, but as soon as I took them out, he continued his rampage. I would rank him with the meanest fish I have ever had, which includes Dovii, Umbee, Trimac, and Red Devil. Beautiful fish though. I lost him in Katrina.