Looking for an ID

[aereaus]

sorry if I'm posting in the wrong place -- feel free to remove the post if I'm breaking a rule. So I added some pink stylophora to my tank Monday and today I noticed a hitch hiker. Overall the coral has seemed healthy and happy polyps extending fully and color returning although it looks fairly unhappy in this photo (rescued it from a poorly kept system.) Can anyone tell me what this tiny crab is?

 

[steelheader.262]

Checkout the fish channel guard crab.

 

[aereaus]

Think it could just be an adolescent? He has interesting markings but is literally the size of a pencil tip

 

[steelheader.262]

There are crabs that form a symbiotic relationship with coral, cleaning and taking care of them.
Hopefully this is one of them.