on 2012 experts from international consortium Reef Arabla sank two 3D - pitted coral reefs off the coast of bahrain. Weighting some 1,00lb (500kg) each the artifcial reefs are made from a non- toxic patented sandstone- like material designed to be more attractive to coral larvae and other marine creatures. And unlike traditional concrete atficial reefs their 3D counterparts are PH neutral.
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