I heard of a trap which required a powerhead with the safety screen taken off with a piece of krill shoved in the intake and when he got close, turn the powehead on (food for the fish now) but that is just cruel. What kind of liverock do you have? If it is florida liverock it is either a wennerae or a havenisis <sp?> They are wicked fast and extremely clever so what I would recommend is if he has a crevis in a rock that he stays in, wait till he goes in it and remove the rock from the tank.
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