How to catch hitchhiker crabs

[CashFan83]

I bought a RTBA a while back and ever since putting it and the rock it came on in the tank, about every other month I have noticed the shed exo skeleton of a crab that I never put in there.(knowingly) I have never seen the actual crab but I have lost random corals while others have been fine. Is there a way to trap him, bait ideas? etc?

[MizTanks]

You may have to do something like getting a night viewing light so you can see where its coming out from~then you may be able to remove the rock in which it may be hiding in. As far as a trap I'm not so sure. Hopefully someone else will chime in with more experience.
I had one and all's I did was wait for it to come out and then quickly netted it.

[Chris]

Fish trap may work, but unlikely. Best bet is probably going to be watch patiently at night and see if u can find it coming out. Toss it in a rubbermaid, bowl or something and get a pic before ya kill it or anything it may not be a bad crab and your coral loss issues could be unrelated to the crab... not saying they are but could be something else Goodluck!