Look on reef central they have a large archieve of what other people have done. I have caught three so far. For the first two, I figured out what rocks they were in and found them after removing the rocks and smashing them. You can also put carbonated water into the hole when you figure out which one it is in, they should jump out . The other I caught after I saw it taking out one of my cleaner shrimp . Got the dead shrimp away from it and used it as bait . Was able to catch it in a net from there. Still have at least on left in the tank just can't locate it.
Good luck!!
