Wow! I would have bet my paycheck that the consensus would have pointed to the wrasse. I say this because they are fast moving and he was the newest member of the tank. (this is also why I am not a fish detective....). The clown makes sense now that you mention it. He has always been very protective of his little area and I have seen him nip the fins of others.

Thanks everyone for your input and thoughts. The clown is now the smallest fish in the tank so I am hoping everyone else is safe.