Mushroom shaped mystery algae

[ThunderGoose]

I feel like I've seen images of this one somewhere before but now that I have it in my tank I can't find it anywhere on line. It's pretty small and very dark green in the tank. Any ideas?

 

[JasonK84]

 

[ThunderGoose]

Thanks.

Let the battle begin!

 

[reef lover]

Id put them in your fuge if you can pull them off.