Sunset Wrasse

Snapshot: As it matures, this beauty sports a vibrant yellow hue (if female) or a striking blue (if male), adorned with green facial markings and fine vertical stripes. With fins that are a riot of color, it's a feast for the eyes!
 
Other tidbits: Can grow up to 13cm or so. Native to the tropical waters of the Indo-Pacific region. 
 
Bare bones must know: Live-rock fish only system. Thick, sandy substrate.