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 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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