I just put 2 new pieces of florida live rock from my LFS i live in the tampa area and he said it is locally grown farmed rock. Today i found a small crab that has claws and these two appendages that look like fans and he uses them to sweep things into his mouth. His legs look stripped. Thats the best discription i can give you. Is he dangerous, will he start killing every thing in my tank, because i woke up this am and my sebae clowns eye was popping out of his head. I havent added any new fish to introduce disease, its not cloudy and it happened overnight. Any ideas folks? :?