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Pollution from fertilizers contributes to the overgrowth of seaweed, so they suck it up and use the seaweed to make more fertilizer? I guess as long as that guy on the bottom is not resting on the reef and the fish can keep the freshly vacuumed corals clean, it's good though.
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I knew I shoulda taken that left turn at Albuquerque! - Bugs Bunny
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