I HAD one of these guys....he was closer to 4-4.5" and was really cool to watch him eat. But like I figured my gar made him into a $30 feeder. In about a month or two Im gonna set up another tank and try these guys or a tat or red tail payara again....then maybe in the future when I get the feel for them I'll try an armatus. But most def. was a real cool fish to have.....for about 27 hours or so.