You usually see the antenna before the shrimp - wispy filaments peeking out of a crack. Banded coral shrimp are generally found in pairs, often with a moray eel close by.
Sharks are known for their impressive teeth... but in the fish world it's the moray eels with their gaping jaws of inward-slanted fangs that you should be wary of.
Everyone wants to know if you see sharks when scuba diving. If you're very lucky you may get close enough to see the texture of their skin!