pesky lobster

[norm685]

I just found a purple lobster in my tank that must have hitched a ride on something(i did not buy one). The problem is that i have noticed that i have lost a couple of small fish to this guy. any body know how to trap this pesky thing. I have been trying for 2 weeks with no avail. I have 180 gal reef tank and about 170 lbs of live rock. so taking llive rock out is impossible. any help would be helpful .

 

[motohead]

a trap maybe??why is taking out the rock impossible?i know it is alot but if that is what needs to be done i guess the choice is clear.....