And if you consider keeping a grey outiside of aquarium walls crazy, then I know some real whacko's lol. (But no, none of us have kept them permanently - That, would be a huge ordeal).
Okay - maybe I should clear up the "crazy" statement. It would be crazy for anyone - who doesn't have connections with a Public Aquarium to attempt to keep a Grey Nurse/Sand Tiger.
LOL - Which just proves that he has more money than brains.
I know that there are some private aquarists have attempted to keep Lemon sharks. And since Lemons can get to be even bigger than than a Grey Nurse/Sand Tiger. The same should apply for Lemons as for Grey Nurse/Sand Tigers. But then IMPO - Lemons really don't belong in the hands of private aquarist, any more than a Grey Nurse/Sand Tiger does.