Whats this on my rock

[thakki]

Can you please let me know whats this dark red stuff on my rock? I see the same happening on some other part of the rock as well. Thanks.

 

[Titans_Reef]

If its hard and not easily removed, then its a certian type of coraline algae. I have different colors of coraline in my tank from bright orange and red with just actinics to the normal purple to green and dark red like the picture.

 

[Newsmyrna80]

^agree....coraline

 

[thakki]

^agree....coraline

So its good I am guessing...right?

 

[DirtinLa]

Correct