Need ID on strange little green things on rocks

[proxy001]

Life is funny, there is stuff you put in the tank that dies and you have stuff that you didn't put in that grows?

I have no idea what that is.
It has to be 1/100 on an inch each. Could not capture with a camera but they look kinda hairy flowers.
I do have some GSP but baby GSP does not look like that.
To give you a sense of the scale, next to it is a 1 inch gonio frag.

Any guesses?

 

[Stuartmercer]

bump!

 

[emilio365]

Do you have any anemones in the tank? They sorta look like tiny baby rock flower anemones.

 

[proxy001]

I do ! Red BTA ... So I don't think it is related.

 

[vetteguy53081]

If recall seeing similar a long time a go - Sponges and filter feeders

 

[Tumey]

Possibly colonial hydroids? I’ve got a couple patches in my tank that glow green like that however they’re not as bright

 

[proxy001]

Oh man, I think you are the winner here. I never heard of them but after looking it up, that very well could be it!
And I understand they aren't a good thing:/

 

[emilio365]

+1 colonial hydroids

 

[emilio365]

Hydroids

Found this on another forum

 

[proxy001]

dang, you guys are good !