Need help identifying. Mushroom or Nem?

[Manolo_AP]

I purchased some palys on a piece of live rock and this lovely creature came along with it. The LFS told me it was some sort of hairy mushroom. I placed the tank high up in my tank. The next morning I find this guy at the bottom portion of my tank next to some zoas that it clearly stung. This is clearly behaving like an anemone moving so far overnight. But what kind? And should I be worried about it?

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[Manolo_AP]

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[Manolo_AP]

This thing is super furry. Never seen anything like it

 

[Manolo_AP]

Anybody? Morning bump.

 

[JPDUSSAN]

I cant see no image...

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[ssminnow81]

I think it's a hairy mUshroom

 

[JPDUSSAN]

I think its a ricordia

 

[Manolo_AP]

Mushrooms don't move that fast overnight. This thing moved about 2 feet. Over a bunch of rocks.
And the ricordia and hairy mushrooms have identifiable tentacles. This thing has fur!

 

[JPDUSSAN]

Correction i take my assumption back.... i didnt catch the portion that it moves....