Reef Critter Identification

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AlexMafi

Aquarium Advice Apprentice
Joined
Jul 6, 2016
Messages
18
Location
Wigan (UK)
Hi

Can anyone identify the critter below?

Thanks Alex
 

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Is this a free swimming item or attached to the rock? I'm not sure at what I am looking at. :( If free swimming, possibly a nudibranch of some kind. If attached, I'm not looking at the right thing.
 
Thanks for the comment. It was on the glass... it's some sort of worm but not sure exactly. Just a bit worried it could be harmful to my corals
 
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