lol.. simple put if you "could" find one, and you "could" afford the many Thousands of dollars it would cost, and you "could"get an insanely large tank to put it in, many hundreds of gallons... you still shouldn't...lol
well, unless you were a syngnathidsexpert
i think we actually discussed this (to limited detail) in one of the seahorse podcasts
and here is a link to some more info
syngnathid.org - Seahorses, Sea-Dragons, Pipefish, and more! 
