What are all these little hairs growing on the rocks?

[sushi]

Nothing important, I am just curious because I noticed these hairs this morning. They don't look like algae to me.

[oo0oscar0oo]

Your rock just hit puberty lol jk. Haha

I've never seen that, I'm curious what it is

[sushi]

I wonder if they are brand new tube corals before they grow out into tubes.

[FreshSaltH2o]

Crazy looking do they retract?

[sushi]

That is a good thing to check... I will poke them tomorrow morning and see if they do anything!

[Accio]

Some sort of hydroid?

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[sushi]

Some sort of hydroid?

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Hmm... after googling, that seems like a good candidate. I will see what they do when I jab them tomorrow.

[Accio]

Ive heard they can be invasive so hopefully its something other than those.

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[sushi]

Ok, I just looked at them and tapped them with a plastic stick and they retracted completely. Now, these are as fine as spider silk. They are very fine and pretty short, like 2-3mm. I guess they are just some kind of feather duster or similar creature, filtering the water for me.