Mimic Chocolate Surgeonfish

Snapshot: Also known as the Mimic Lemon Peel Tang, or the Mimic Surgeon. As a juvenile, its oval body is predominantly yellow, with blue accents around the eyes, resembling the Lemonpeel Angelfish. When mature, its body darkens to tan with vibrant red highlights around the eyes and pectoral fins. 
 
Other tidbits: Can grow up to 20cm or so. Found in the regions from tropical waters of Northern Australia, to the southern and eastern Asiatic coasts and the Pacific.
 
Bare bones must know: Live-rock fish-only system, fish-only system, or reef aquarium.