I am glad you posted that.......
I got LR
from liverocks.com too (awesome rock) and here's what happened to me:
1. Got rock, found a mantis in the box that had jumped out and QTed him.
2. Negated the FW
dip because I didn't want to hurt anything.
3. Put all of the rock in the tank and skimmed, worked out great.
4. Kept hearing SNAP SNAP SNAP snap snap snap, snap snap SNAP every day.
5. Pulled every single rock BACK OUT and performed a freshwater dip, looking for a mantis shrimp.
Well lo and behold, NO mantis came out, but I did see a bright red "baby lobster" thing that shot out, I quickly put him back in the tank.
My baby lobster ain't no lobster, it matches your pic exactly..
And I still hear snap snap snap every day so he must have survived the dip just fine.
He snaps a lot during feeding times, and also snaps and pops sometimes and little clouds of rock shoot out, so I know where he's at.
I'm gonna keep him because the tank is downstairs and we sleep upstairs so he can't wake us up.
THANKS for posting that pic!!!!