[reefkoi]

Yeah thats a bad one you should remove it and trash it or put it in someones fuge if it makes you feel better.
I thought the same as Lordhelmet that everyone was full of it when it came to these guys until a week ago when I noticed one in an acro and he ate a lot of the center branches tissue! you couldnt see it toogood but once I pulled the coral and saw him down in the cener of all the damage I got rid of him.

The coral is fine now and will probably re-grow over the damage but I would have lost the acro if I left the crab in there.
C