OK, an on topic post. In my opinion, you will need a very, very large tank to keep these sharks in captivity, at least the size of an Olympic swimming pool. I base my opinion on my observations of seeing these creatures swimming in their natural surroundings when I am scuba diving. I am making no comment on other fish available in the fish trade. If the original OP wants to say, "while, what about this fish.." we can debate that elsewhere.
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