What Type Of Algae Is This?

[BamboozleBean]

Came on a piece of rubble rock.
I don’t think it’s Cyano as it’s not slimy, but it’s a deep red almost purple.

 

[Reefer1978]

I'd say Cyano, as it's not too slimy, but could be spirulina.

 

[Fishnut]

It looks to me like Turf Algae. Comes and goes when I over feed the tank. Vacuum gravel and cut back on excess feeding And increase flow, usually keeps it in check.

 

[DSC reef]

Looks like red cyanobacteria. Try blowing it off with a turkey baster or siphoning during a water change. It's common in newer tanks.