Crab came on anemone rock what is it???

[JennyH3]

My black widow anemone had a little friend come with him. It’s obviously a crab what kind?

will it eat my sexy shrimp - snails - pistol shrimp? Reef safe??

I have him in acclimation bin still.

 

[monkeyCmonkeyDo]

Looks like a porcelain crab.
Good freebie