What?

DeniseAndy

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I had one on some live rock. I am no expert, but that is either a medusa worm or sea apple.
 
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Kanshi

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Those look like feeding tentacles of some sort of sea cucumber- look up magnum sea cucumber- its not that species but it shows a similar structure- aslo it may just be bacuse I’m on my phone but the video isn’t working for me.
Boy that looks right, but its so small, barely visible to the naked eye.
 

ScottR

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I can’t see the video either. But from the pic, agree with sea cucumber feeders.
 
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KJ

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Sea cucumber.
 

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