What are those?

unitedaf

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What are those while hairy things around it?

A6C9EF62-B939-4EBC-BEFE-A4041D71FB0E.jpeg
 
Mesenterial Filaments I believe.
 
Old worm tubes often found on rock in sump. You can scrape away with old credit card
 

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

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