There's a Smitty's in town in Calgary where for a treat every couple of weeks or so, we'll go for breakfast (Texas skillet, yummmmm
). Anyhow in the centre of the restaurant is about a 600 gallon FW tank (6' x 6' square, approx. 30" tall ... minus a 24"x24" square in the centre, making the tank a square "donut" shape). In there they have some albino oscars, some large plecs, some cats and some other fish, and one white arrowana easily some 36" in length. Very cool to watch.
What's neat is watching how he breathes, seems to draw water in quite differently from how other fish do it.
I could see that they'd jump quite easily. Man when that fish wants to move, he can move.