Nemateleotris decora | ©Benjamin Naden (Raja Ampat, Papua, Indonesia)
The Purple Fire Goby, Nemateleotris decora (Perciformes - Microdesmidae), also known as the Elegant firefish, Decorated firefish, Purple dartfish, Decorated dartfish, or Flame firefish, is, as its name suggests, a colorful fish from the Indo-Pacific region.
It is a reef-associated fish, found often in pairs (they are monogamous). Feeds on zooplankton, especially copepods and crustacean larvae. Darts into a hole when alarmed.