Spreading everywhere need ID

[D. Torres]

What are these? At first I thought they were baby rockflower nems because my rockflowers spawned in my tank and they are growing but these grew a lot faster and there's a lot of them. They are about the size of standard zoa head. They have a white "skirt". They close when they are disturbed. These are the best pictures I could get of them any help with ID and how to get rid of them would be appreciated. Thank you.

 

[taricha]

tunicate I think

 

[elysics]

Yep, some kind of Botryllus sp.

I wouldn't worry about them, they can't sting anything

 

[D. Torres]

tunicate I think

Looked up tunicate but doesn't look like the pictures I found.

 

[D. Torres]

Yep, some kind of Botryllus sp.

I wouldn't worry about them, they can't sting anything

I think you're on the right track. There's a lot of them and they're spreading fast. I wish I could get a better picture.