soooooooooo wtf is this? and why does it creep me out

[Corbin]

hahaha, that was kinda mean, feel free to hijack thread with stories & pics.
yeah id be surprised was hiding in those rocks. they dont call them live for nothing haha.
i got a mantis shrimp in there i saw when i first added the rock, bearly a inch big, but every now and then like right now i hear it clickin as it hits something, so far no inverts have been killed and it hasnt shown it self in over a month.