Mystery Wrasse

Snapshot: Also known as the Whitebarred or Fivebarred Wrasse. It sports a vibrant palette of yellow, blue, and purple hues.
 
Other tidbits: Can grow up to 12cm or so. Native to the tropical waters of the Central Western Pacific including the Great Barrier Reef. A younger Mystery Wrasse's color can morph from green to red in the aquarium. 
 
Bare bones must know: Best suited to reef aquariums with plenty of live rock. Thick, sandy substrate.