White stringy things growing out of rock

IAReefer

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Iowa
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What are they?

655385E2-C1C3-444B-927F-79C1E1AB083D.jpeg
 
I forget what they're called but they're harmless.
 
Would still avoid them getting close to coral. I have something similar (or the same) and it irritates coral pretty bad sometimes.
 

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

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