I know of people doing it. In fact that's what a lot of professional aquariums do, at least the ones near a shore, Vancouver Aquarium being an example. They don't mess with IO they get the real deal.
The main thing that would concern me are pollutants. Also, being from cold water here in Canada I wonder if parasites and bacteria would be a problem in a tropical environment or if it would all die.
Other than that, what better source of sea water than real sea water?
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