Valentini Pufferfish

Snapshot: Flaunts a vibrant palette, sporting dark brown bands on its midsection, brownish-orange spots on its lower half, and electrifying yellow fins. Bold blue striping runs along its back. Despite lacking pelvic fins, this adaptive creature deftly maneuvers using its pectoral fins.
 
Other tidbits: Can grow up to 11cm or so. Native to the waters of tropical Indo-Pacific region including the Eastern Australian coast, and the Red Sea. When threatened, it inflates its body to almost double its size.
 
Bare bones must know: Live-rock fish-only system, or fish-only system. Top-notch filtration to cope with messy eating habits. Use a container, not a net, for transfer to prevent stress. Handle with extreme care, its defense mechanism, tetrodotoxin, is lethal.  When threatened or when it dies, it releases a toxin deadly to other tank mates. Best kept in its own aquarium. Larger sized aquarium needed.