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Does look like a nudibranch. Have you added Berghias? Got any Montipora or Zoanthids? That really could suck
It's not berghias, I'm afraid. It's also not a monti predator but looks like a zoa predator.
You might want to build yourself a siphon similar to the one pictured in the link below. Having this handy will definitely help when things like this show up.
http://www.melevsreef.com/flatworms.html

