Small White crab on snail?

[MarylandReefer13]

So, I was looking at my tank just a little bit ago and I say this little white crab on one of my snails. So as any concerned tank owner I looked up what it was and found no use full info. So I have come to all of you for help to find out what it is and if it is a good or bad crab. Here’s a picture so you guys can see.

 

[Cleo642]

Idk but he's cute.

 

[Alexopora]

So, I was looking at my tank just a little bit ago and I say this little white crab on one of my snails. So as any concerned tank owner I looked up what it was and found no use full info. So I have come to all of you for help to find out what it is and if it is a good or bad crab. Here’s a picture so you guys can see.

Could be a kind of commensal crab that lives with snails? It does remind me of the pea crabs that we usually find inside of bivalves (clams). Yours looks fragile, soft with almost non existent eyes and small appendages which is why I suspect it must be some form of commensal crab.