I posted last week regarding this... Don't rip it off of the rock you will end up with hundreds of them... Pep. shrimp will eat small ones , mine never touched the large ones...
With advice from the board here, I shot my large one with 3cc of Turbo Calcium (kent)... I used a regular metal needle, mixed up the cal. with tank water ... He went into his LR hole right away, and hasn't been seen since... I think this method is the only way to go !