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?

Reef Cleaners

A good guide to identify most of the nuisance algae that plagues the hobby. Complete with pictures and suggested treatments

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?

Reef Cleaners

A good guide to identify most of the nuisance algae that plagues the hobby. Complete with pictures and suggested treatments

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.