Sponge or Worm?

Kieko250

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Hello everyone , I just noticed these under my live rocks. Some are skinny one is fat. Help with ID please.

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A Piece of the Ocean for Every Reef Tank

i cant think

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That is a Pineapple sponge. Mine never bothered anyone.
I agree with this, it looks a lot like a pineapple. I’ve not had any yet but I’ve had similar ones and they just grow casually, ignoring everyone else
 
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