mantis shrimp

[tomini]

Hi everyone a friend of mine has a problem with a clicking noise and a huge loss in his cleaning crew
he suspects a mantis shrimp and im wondering if anyof you knew how to get rid of them??
the mantis would be up for grabs (free) if he caught it
taking the rock out is out of the question since his structure is glued and are made of very large pieces with corals attached
any help is greatly appreciated
thanks