Is this Cyano?

[Nathan73]

Hey guys, noticed a few dark purple spots on one of my rocks, could somebody help identify if it is Cyano or possibly coraline?
thankyou

 

[blaxsun]

Looks like coralline.

 

[Nathan73]

Thanks mate, was hoping so

 

[Gedxin]

Can you blow it off with a turkey baster? If not, it's coralline.

 

[mdb_talon]

Agree take a turkey baster to it or rub your finger on it. If either remove any it is not coralline.

 

[WheatToast]

Possibly Peyssonnelia as well if it does not brush off.

 

[Nathan73]

Thanks guys, tried to rub some of it off this afternoon and it didn’t budge, so corraline it is
Appreciate all your help cheers