Our largest is a 19" Jardini Arowana. He's about 5" deep and 3" thick. Our largest potential growers are a South American Lungfish (SAL) that can reach about 3 feet, a pair of Leopoldi Stingrays that can easily reach over 24" in diameter (that's just disk diameter and doesn't include a long tail), and a male Red Tail Gourami. We'll soon be getting a Tiger Ray (which can get the same size as the Leopoldi) and a Tigrinus Cat which get large as well.