Threadfin Wrasse

Snapshot: Males rock a bold look with shimmering green or electric blue bodies topped off by fiery red heads or dorsal bling, while females flip the script — sporting sizzling red bodies accented with sleek green racing stripes.
 
Other tidbits: Can grow up to 10cm or so. Distributed throughout tje East Indian Ocean, Australia, Japan, Indonesia, New Zealand, Central/West Pacific Ocean. Without his lady crew, the lonely male may start to lose his sparkle — his vibrant colors may fade.
 
Bare bones must know: Live-rock fish only system or reef aquarium. Thick, sandy substrate.