White wispy stuff on my rock

[DangerClose]

Hey guys. I got some weird white hair/cotton stuff growing on the rock with my Xenia on it. Should I pull this out immediately or is it something beneficial. If I should pull it out, should I just dip the rock?

 

[Hoodstream]

I have never dealt with this but found this rabbit hole https://www.reef2reef.com/threads/algae-va-bacteria.265528/#post-3173068

 

[EeyoreIsMySpiritAnimal]

It looks like a sponge. if so, it's a good guy.