Coral? Barnacle? Cucumber?

davidflagg

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And here I thought I was at least decently familiar with most hitchhikers out there. I haven't the slightest clue what this could be.

Weirdest part is that it wasn't there just a few hours ago. Bare rock this morning.

1.jpg 2.jpg 3.jpg
 
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davidflagg

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Just to check, is it still there?
Apparently it's mobile, as it disappeared a few hours after taking the photos. Best guess is a bristleworm like the above comment said, but beats me where that fluorescent blue comes from. I've got bristles in my tank, but they aren't blue.
 

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