ID request. Green grass?

[Calmbeast]

Hello all. I just noticed this green Grass looking growth on some live rock. I've had the rock for about a month, and it was purchased from the lfs. Any help would be much appreciated. Thanks!

 

[tyler1503]

Bryopsis maybe?
It's supposedly difficult to kill off but I've never had to deal with it before.

 

[NanaReefer]

Doesn't look to be Bryopsis to me.

 

[Calmbeast]

I have the rock quaritined until I find out if this is good or bad. At first I thought it could be aptasia but upon closer inspection I don't think it's that.

 

[fishroomlady]

I vote bryopsis as well - I'd manually remove it

 

[Calmbeast]

If I let the rock dry out would that kill it off? I think I'll try to pull it out first.