Help! Mantis shrimp discovered!!

[aquatechy]

So I decided that it was time to redo my rock structure and frag some of my overgrown corals this long weekend. Started Monday morning, and worked into the afternoon to rearrange stuff. All done, I was feeling pretty good.

A little later though, I walked by my tank and I saw what appeared like a goby pop out of some rock and grab a shell. I knew I had no gobies, so I had to investigate. I stuck some krill in front of the cave where this creature appeared, and lo and behold, out comes Mr. Mantis to grab dinner. I have no idea how long he's been in my tank, but I suspect that my major shuffling of rock must have disrupted his home. I stare into the cave, and see two beady eyes staring right back...

I don't know how to tackle this problem... I'm thinking that I've got to remove him, but don't know how to do it. Any thoughts/advice/wisdom on how to tackle this? To further complicate the situation, the rock he's settled into is the rock my anemone and clownfish call home.