Black Leopard Wrasse

Snapshot: Sporting a sleek dark body peppered with light blue to yellowish spots, this fish means business. Its dorsal fin has bold black and white diagonal stripes, while hints of fiery red might grace its head and tail for added flair.
 
Other tidbits: Can grow up to 10cm or so. Endemic to Australia, it is found in the northern coast from Western Australia to Queensland.
 
Bare bones must know: Live-rock fish-only system, or reef aquarium. Mature and well-established aquarium with plenty of live rock. Thick, sandy substrate. Expert aquarists only.