What are these shells on my GSP?

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Army_of_mantis_men

Army_of_mantis_men

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I have noticed these shell-like shapes on my GSP, what are these? Where do they come from, is it good/bad? Should I do something about it? The photo is taken in the morning before the lights turn on, when it comes out it looks healthy as ever.
Thanks!!!

20250712_082037.jpg
 
Coral Stop
Tunicates
 
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WHAT MOST OFTEN MAKES YOU REACH FOR YOUR CAMERA AROUND THE REEF?

  • Coral behavior (feeding, extension, or movement)

    Votes: 2 8.0%

  • New growth or a color change

    Votes: 3 12.0%

  • Unusual fish behavior

    Votes: 0 0.0%

  • The whole tank looking especially good

    Votes: 8 32.0%

  • Something I want to document in case it changes

    Votes: 2 8.0%

  • A funny or unexpected interaction

    Votes: 2 8.0%

  • I usually put the camera/phone down and just watch

    Votes: 4 16.0%

  • Other (Post in the comments)

    Votes: 4 16.0%
See comments…

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