Bad red algae?

[lxxnp1234]

There is some red algae growing in my tank. It's only growing on the rocks. The color is red but darker than the coraline in my tank. The shape of it looks like the red monti cap coral, one piece and thin, and some part of it grows out of the rock.
I think it's not the slime algae. Anyone know what is it? Bad algae?
Thanks.

 

[spanko]

Red plating coralline algae. Good stuff.
Like this?

 

[lxxnp1234]

Yes, exactly like that.
Will it grow quickly? I found it is bothering some of my zoas.

 

[spanko]

Mine doesn't grow that quickly.

 

[lxxnp1234]

Sounds good. Thanks.