Bicolour Parrotfish

Snapshot: As juveniles, they sport a crisp white hue with a bold orange band across their face. When fully grown, males transform into dazzling blue-green beauties adorned with pink markings. Their distinctive pointed snout is reminiscent of their avian namesake, the parrot.
 
Other tidbits: Can grow up to a whopping 76cm or so (fully grown adult)! Native to the Red Sea. These voracious eaters can devour hefty amounts of algae from rocks, keeping your tank clean and vibrant.
 
Bare bones must know: Best suited to a live-rock fish-only system. Colossol size aquarium needed (to accomodate its growth).