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Cypraea moneta, The "money cowrie" is usually 3/4" in length and an excellent reef herbivore, grazing on all types of algae.  Money cowrie are so named because they make a "clinking" noise when handled in groups- sounding a lot like pocket change.  Will not bother other invertebrates or corals, a very efficient herbivore consuming different varieties of algae from reef aquariums.  Recommended qty of 1 per 10 gallons, or 2 per 10 gallons in aquariums that have excess of algae.