Hitchhiker - can you identify?

[lunaticcat]

Found this little bugger on a new coral during the dip (he survived the dip and is in a holding bag)

is this a keeper or kill it situation?

 

[AlexStinson]

Pistol shrimp, probably fine, might be the kind that can pair up with a watchman goby.

 

[hopperjl16]

+1 on the tiger pistol shrimp. I just bought one today for my watchman goby!