Red Snapping Shrimp

Found living and hiding, with their host corkscrew anemone - Bartholomea annulata, over shallow, coral reefs.
They feed nocturnally on tiny invertebrates and zooplankton.

This shrimp is difficult to distinguish underwater between Alpheus immoculatus, Alpheus polystictus, Alpheus roquensis so this is just a tentative ID!

Snapping Shrimps usually share their holes with various Gobies. While the shrimps dig out their holes the gobies stand guard, as the shrimps vision is poor they usually keep one antennae in contact with their goby partner.
Snapping Shrimps have a large claw, which they are able to snap, giving a load cracking noise and at the same time this produces a large jet of water, used in defence to either deter or to knock out their prey.