What is this purple algae?

[Djscrubba]

Hey, does anyone have an opinion on what type of algae this is growing on my rock? It is purple, tough and cannot be blown off and I can only remove it by scraping it off with a knife. And any suggestions on how to keep it at bay? Thanks

 

[DraggingTail]

Take a video while you scrub it. I assume you are talking about the maroon stuff. The Violet underneath is obviously corraline

 

[Silver14SS]

Gelidium?

Nuisance Algae ID Guide- Reef Cleaners

Nuisance Algae ID Guide. Red Slime, Cyano, Cyanobacteria. Green Film Algae, Film Algae. Green Hair Algae. Green Turf Algae. Bryopsis pennata and B. plumosa. Bubble Algae, Valonia. Lobophora. Blue Green Cyano.

reefcleaners.org

 

[Djscrubba]

Yes, I guess you can call it maroon in color. The tank lights shut off for the night so I can’t take a video now, but I can tell you that it doesn’t budge when I‘ve tried to brush it off.

 

[X-37B]

Gelidium?

Nuisance Algae ID Guide- Reef Cleaners

Nuisance Algae ID Guide. Red Slime, Cyano, Cyanobacteria. Green Film Algae, Film Algae. Green Hair Algae. Green Turf Algae. Bryopsis pennata and B. plumosa. Bubble Algae, Valonia. Lobophora. Blue Green Cyano.

reefcleaners.org

Yep thats what it looks like to me.
It grows quick.

 

[Djscrubba]

I looked at the link you sent, thanks. Any thoughts on why it surfaces? High or low nutrients? Lighting?
Just because?

 

[Juice780]

I had that and it went away on it’s own. I didn’t have it as bad as you did.

 

[X-37B]

It grew out of my live rock after almost a year unseen in the tank. Turbo snails ate it all and it never came back.
It grew pretty fast in my nano. Added the turbos and it dissapeared.