Elegant firefish (Nemateleotris decora)The Elegant firefish is a species of dartfish native to tropical waters in the Indo-West Pacific, from Mauritius to Samoa, north to Ryukyu Islands, and south to New Caledonia. It is found over hard, open bottoms of reefs, sandy patches and rubble, as well as deeper coastal outer reef drop-offs where there are strong currents. It reaches a maximum length of 9 cm (3 in). This species is often found in pairs and is monogamous. They feed on zooplankton, especially the larvae of copepods and crustaceans. They will dart into holes when alarmed.