What is this green algae?

[Reef Devils]

I just bought this rock with a bunch of mushrooms on it. When the mushrooms are closed, you can see this green stuff on the rock. Is it bad?

When the mushrooms are completely open you can’t see it

 

[Reef Devils]

I just bought this rock with a bunch of mushrooms on it. When the mushrooms are closed, you can see this green stuff on the rock. Is it bad?

When the mushrooms are completely open you can’t see it

Bumb

 

[UMALUM]

Green coralline kiddo, your fine.

 

[Reef Devils]

Green coralline kiddo, your fine.

Oh cool. I didn’t know that was a thing.

 

[SteveMM62Reef]

Now I’m jealous, been looking for Green Coraline for years.

 

[Reef Devils]

Now I’m jealous, been looking for Green Coraline for years.

I still like the purple or pink better but it’s cool to have a different one now.