[Help identify] Algea, Cyano??

[nicolasoop]

 

[wculver]

Based on the pictures I would say it is not cyano. Cyano will generally be red in color and when conditions are right to spread it'll take off quickly.

 

[ISpeakForTheSeas]

Welcome to Reef2Reef!

I'm not quite sure what you have here, but it's interesting. Texturally it looks like a sponge in some places and a macroalgae in others; personally, I'd assume it's a macroalgae of some variety, but I'm not sure.