On our recent trip to the Maldives with Diamond River Outfitters, the single fly that stood out above the rest for small fish was the Spawning Shrimp. The Spawning Shrimp has a ton of movement, incorporates bright orange trigger points, and can be fished static or fast-stripped.
Tied by Flyz Inc. on decent Gamakatsu SL11-3H hooks.
Price is per fly.