Please identify this stringy stuff on my rock?

[Stinger]

 

[revsgirl]

:bump2:

 

[Kano]

Looks like it could be sponge. I've had sponge that branched like that.

 

[Troylee]

I would say feather dusters as my first guess with sponge for the second... It's either one of those thou... Do you ever see feathers "heads" on the end of tubes?? I'm looking from my phone so it's hard to really see it up close..

 

[NVTE]

Sponge. Good thing to have

 

[Stinger]

Nope, never seen any feathers from this stuff. if its sponge and no harm , then im ok, Thanks folks

 

[Skinpuppi]

X2 sponge