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It doesn't take a degree in Marine bio to know if you put something in the ocean, critters will flock to it and grow on it. We just need to be careful what it is we are putting in there.
They certainly are very productive for a number of different species. In essence they are biological islands if present in areas of soft bottoms since they provide an isolated area of hard substrate. The currents around them often provide good food for filter feeders. However they are still artificial habitats with unusual structure compared to most natural habitats. I do enjoy diving them.
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