New shrimp addition?

[CocoReef]

I found a very small shrimp larvae scurrying around my tank and while I have no shrimp, the little guy definitely hatched no more than a few days ago. No clue how it got in there unless there was an egg attached to one of the turbos I added a few weeks ago.

I doubt the video will be any help (if it can even be played) in identifying it at this stage but should I let him grow out? If so should I be worried about it getting enough food or my emerald crab eating it?

 

[Sharkbait19]

Just looks like an amphipod - won’t get any bigger than that.
They hitchhike in on rocks and sand, and you probably have a lot more.
They are beneficial to the system.

 

[AlexKintner]

^^ This ^^

Have a look after lights-out and you will likely see many more. Mine tend to congregate in a sandbed paly colony. Biggest ones are over 1/4 inch