What do The Ghost Shrimp eat, and how do they feed? Not how do I feed one, but in the wild.

Which kind?

Ghost shrimp is a name applied to at least three different kinds of crustacean:

Thalassinidea, crustaceans which live in deep burrows in the intertidal zone.
Palaemonetes, small mostly transparent shrimp commonly sold for use in freshwater aquaria
Caprellidae, amphipods with slender bodies more commonly known as 'skeleton shrimps'.

All of them, would be really helpful!

All of them, would be really helpful!
They are all on Wikipedia. All you have to do is Google each name.

It's amazing how you were able to find this site, but are unable to Google any information. Hmmm...