This information is from the Wikipedia,
Adults reach up to 130 cm (4 ft) in length and can weigh up to a maximum of 44.0 kg (97 lb).
Many fish owners are unaware of the enormous size that an iridescent shark can reach. If given enough room and fed adequately, an individual of this species can reach 3 feet in length. In most home aquariums, the amount of space an iridescent shark has severely stunts its growth. Therefore, most iridescent sharks kept in home aquaria grow to only six to twelve inches in length and die prematurely from organ failure. As a rule of thumb, an iridescent shark requires a minimum tank size of 305cm (10 feet) to grow to a healthy size. Schools require even larger tanks.