Long spine urchin question

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TiggrReefer

TiggrReefer

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As you view the video, what is happening with the movement of the “blue dots” in the center?
What sources do you consult if you want more detailed information?
Thanks
 
https://affordableaquaria.com/
I would guess (quite possibly incorrectly) that those are the tube feet blowing in the flow of the tank.

I'll give you a bump for others to hopefully list some sources for you.
 

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WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

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    Votes: 13 16.5%

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    Votes: 48 60.8%

  • Water clarity or surface appearance changes

    Votes: 12 15.2%

  • Equipment sounds or flow seem different

    Votes: 9 11.4%

  • A test result catches my attention

    Votes: 17 21.5%

  • Algae or other growth starts changing

    Votes: 16 20.3%

  • I usually notice when the problem is already obvious

    Votes: 4 5.1%

  • It depends on what’s going on

    Votes: 16 20.3%

  • Other (Post in the comments)

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