Weird white feather looking things on live rock?

[DoINeedAName?]

There are weird tiny white feather looking things on my live rock. Only on one rock so far, pretty new. They curled up when one of my hermits crawled over them and then slowly opened back up when he was gone.

 

[i cant think]

There are weird tiny white feather looking things on my live rock. Only on one rock so far, pretty new. They curled up when one of my hermits crawled over them and then slowly opened back up when he was gone.

Honestly, I’d say they’re feather dusters - They’re harmless to reefs and actually do more good than bad