THis is INSANE!!! Don't try to fit the shark to the minimun size tank, rather, try to give the animal the most room possible. It surprises me that people would like to own one, but don't want to give it what it really needs- room to swim and grow. I wish that people without experience would not post their suggestions when they are just guessing. There are ample amounts of people who know what they are talking about, but get no respect because they provide answers that nobody wants to hear.
In my opinion, every shark owner should have the biggest aquarium that they can afford. If you cannot provide a very large aquarium for a particular species, DON'T GET IT!
I appologize for such emotion, but this seems to have gone too far!