Gets up to 40" long, is an active swimmer and lives in shoals. For comps, a shoal of these in a 8'x3', is comparable to a shoal of tinfoils in a 20L. At 29" (which I believe are the ones in the pics below), they weigh in around 17+ lbs, so 3 @ 29" would require around 1/2 lbs of pellets (or equivalent) per day to cover 1% of body weight. A single full grown one would weigh around 40-45 lbs and obviously consume far more.
Personally speaking, I like the tinfoil look a bit more and find it more colorful. Full grown in a tank, a shoal of these must indeed be an awesome sight.