I'd trust the LFS even less as far as collecting that water. For that cheap, they must be collecting it themselves. And what quality control could they really have? I would never even think of using ocean water from around here, but if I was out on a boat off the coast I might try to collect some and test it.
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20L Planted with CO2, fertilizers, VERY high lighting and community fish
72bow SW about to start adding corals