to be perfectly honest, i have no clue about the hardiness of sharks. although imagine that they are going to be stressed no matter what you do. i say this because a fish that size travels a large distance, and IMO it doenst matter how big a tank you get, it will still be a stress factor on the fish. if the tank is opaque this might actually help though. once again, just guesses. so i suppose my point is that the better the water quality, the less stress on an already stressed fish. however they obviously have been successfully kept in aquariums by a lot of people, so you probably will do a fine job if you know what you are doing. (imo i think you do)
GOOD LUCK