Scopas Tang

Snapshot: Also known as the Brown Sailfin Tang. Its body morphs from gray to brown, yellow, and white, with a gradient that goes from light to dark. This gorgeous body also has delicate light blue markings, adding an extra layer of intricate beauty.
 
Other tidbits: Can grow up to 20cm or so. Range extends from the Red Sea, eastwards through to the Indo-Pacific region and through to the east Pacific. As juveniles, they start out in vibrant yellow, then deepen into maturity with darker hues.
 
Bare bones must know: Live-rock fish-only system, fish-only system, or reef aquarium.