How to catch the hitchhiker crab, pls?

[Celine]

I notice a hitchhiker crab. I don't think it is reef safe but it moves so fast & hides in the live rock.
Any suggestion on catching it, pls?

 

[Mrc8858]

If you know where he's hiding get a glass and put a shrimp in it leaning on the rock once it goes in can't climb out

 

[Celine]

Very good idea, thanks.

 

[Josh1158]

A pop bottle with some bate proped up so it can get in but not out works too

 

[kaoticnoodle]

Plastic bottle cut in Half with the top part inverted and taped inside the bottom half with some pellets worked for me but you will also catch other critters just takes time... Caught three xanthid crabs who were digging through my live rocks and killing my snails -____- ... They were food for a predator tank... Eye for an eye lol