Green things in my sand.

Shane1

Reefing newb
Lately I have been plucking these little green things out of my sand. They have 5 or so long arms that stick out of the sand, They anchor themselves about a quarter inch under the sand. I cant tell if they are just algae or actual creatures. I would like some help identifying them and if I need to get / how to get rid of them. Here are some crappy pics i got to try and help. Thanks
 

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