If you ever see a behind the scene's tour of the Van Aqua. you'll see that they have huge, very extensive sand & other filtration systems and their nsw is not collected near the surface, which is what you would be doing.
You're much more likely to contaminate your tank and kill off your tropical livestock than see any benefits.
Coldwater BC tank, go for it. Reef tank = NO.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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