What is this on my rock?

gabrieltackitt

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Noticed this during a WC today. Any ideas what it is?
B23DFFFE-0679-4997-82E5-E3D4F00FEFBA.jpeg
 
Are the tubes white or blue?
 
Is it hard? Maybe a tube worm.
 
Sponge.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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