Longnosed Butterflyfish

Snapshot: With a long snout, this butterflyfish is a master at snagging snacks from crevices and coral heads. Its yellow body sports a head divided horizontally — black on top, white below. Watch out for those long, jagged dorsal spines!
 
Other tidbits: Can grow up to 22cm or so. Native to the tropical waters of the Indo-Pacific region and the Red Sea.
 
Bare bones must know: Live-rock fish-only system, fish-only system, or reef aquarium with care. Top-notch water quality.