Copperband Butterflyfish

Snapshot: Its vibrant orange-gold and pearlescent white or copper bands adorn both sides of its body. It has a mysterious dark spot near the end of its dorsal fin, cunningly resembling an eye (perhaps a clever ploy to confuse and deter predators?). 
 
Other tidbits: Can grow up to 20cm or so. Range extends from East Africa, via the Indian Ocean and Indonesia, into the Pacific. If you're looking for an aiptasia assassin for your aquarium, the Copperband is your ultimate weapon.
 
Bare bones must know: Live-rock fish-only system, or reef system with care. Keep a close eye out for the first hint of thinning. Stable, top-notch water quality.