White Little Hair Like Growth on Rock

Kacor13

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anyone know if this is good or bad. See hairy thing on left side. That’s the longest one / most noticeable in a picture. The rest are really small and more noticeable in a video. I’ve had my tank for about 1.5 months.
 

Beau_B

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Hard to see, but my guess would be digitate hydroids.

Debatable on the good/bad. I had them and they eventually disappeared. Others have reported sustained population and mild coral irritation.
 

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