I have heard the clicking sound in my tank that I can only assume is a mantis shrimp expanding its home. The problem is i have looked everwhere and can not find the culpret. I haven't even been able to narrow it down to which piece or live rock the clicks are coming from, because as soon as I get close enough to try to narrow it down they stop. I have read a lot about trapping them and getting them out once you know where they are at, but does anyone have any tips to help locate them?