Blue-green Chromis

Snapshot: These fish dazzle with a turquoise-blue body, fading to vibrant green at its tail. Sunlight dances on its shimmering scales. 
 
Other tidbits: Can grow up to 8cm or so. Range is from the Pacific Ocean, east of the Philippines, Papua New Guinea and eastern Australia. They're energetic swimmers and playful, darting in and out of crevices. Constantly on the move, exploring their surroundings.
 
Bare bones must know: Any aquarium will do. Best in groups of three or more. Speedy eaters, so be mindful not to leave others hungry when stocking chromis.