These aquariums that we speak of have multi million dollar setups, I think they can get away with it because the water is sure to be rid of any polutants. I think Zoodiver might have more insight on this, but I wouldnt risk it specially if you have coral and expensive reef safe fish. There is just too much that can go wrong, not to mention they have already built up an immune system to their man made enviornment, whos to say theyd survive mother nature after all the chemicals poured into LFS systems anyway.