what is this

[chris_ely]

I've started getting this blackish brown algae stuff on my rocks. any idea what it might be? also what is the maroon looking algae stuff and what do I need to do to get rid of it.

 

[Reefing Madness]

 

[Williamthegr88]

Wow never seen black algae before you would think someone on here would know what it is

 

[chris_ely]

it almost looks like I've got more of it since last pic.