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
 
Dr. Reefs Quarantined Fish
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