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Some corals incorporate strontium in their skeletons. Natural seawater has a leval of 8ppm strontium, and although being a amjor trace element, supply may be quickly depleted by hard corals, coralline algae and even gorgonian type corals. Benifits obtained are an increased growth rate of hard corals. Coralline algae will also grow at the expense of less desirable algae.