Surprises in live rock

[snakes'n'fish]

I got some live rock from the LFS monday, and it was full of surprises!I picked up one of the larger pieces and still in the bucket was a 3" ugly black shrimp. I am pretty sure that it is a mantid , by body structure. Could'nt tell you if he is a slasher or a basher. I added him to my aggressive tank. I had no where else to put him. He is not fairing to well with the triggers. but it is better that in my reef tank and all the small fish. That piece of rock had macro algae all over it and today a 2" feather duster openned up.
I am sure there are other people out there have had better luck than me. What is the wierdest thing you found in a fresh purchase of live rock ? Mine is the mantid.
I like aggressive fish, but not ones that bust a fish tank

 

[striker]

I've had starfish, polyps, urchins, crabs(emerald), dusters, a small toadstool, and a baby open brain(only lasted 2 months). Getting lr was the most exciting thing when building my tank. I can't wait to get another just so I can order tons of lr. The weirdest hitcher I saw someone get was a small octopus.

 

[j21kickster]

check my ID this (PIC) post- no clue and no one else so far knows what it is

 

[danrw84]

lucky!
i recently got a turbo snail, and he's got a orange duster attached to him, really small though