Crab hunting

[blizzack1]

So, I've lost one cleaner shrimp, two peppermint shrimp, and now one small clownfish two days ago, since I started my saltwater tank maybe 9 months ago. 

While that has been happening, my fish and coral have been growing well enough, and everyone seems happy, so when I lost the clownfish (disappeared without a trace) I was worried I had a pest of some sort.

Well, as luck would have it, at feeding time today, a LARGE crab emerged from the sand, helped himself to some pellets, and went into a cave.

I tried to coax him out, and almost got him.. and ended up grabbing the piece of liverock he went in to. 

Seaching online, I then subjected him and the rock to a steady stream of carbonated water, then a fresh water dip (that lasted a while) and now i have the live rock (with him still inside) in a bucket with some tank water, wondering what my next steps are.

Have I reached the point where I can't put the live rock back in tank?  Where do I go from here?

Thanks!

[Roland]

Take an appropriate sized pop bottle. Cut off the top and invert it. Adhere the inverted top to the body. Add food and submerse.
See what that does.

[Greatwhite]

He already "disposed" of the crab another way.   That crab won't be bothering anyone anymore!!!

[blizzack1]

A fearsome adversary, to sat the least!