Start of coraline?

[Phantom7]

Is this the start of coraline? It looks really stringy

 

[fishski13]

looking at the pic it looks like the purple stuff is fuzzy and almost stringy like your hairline algae issue which makes me believe it is not coralline. Coralline would be a hard encrusting type purple where you cannot scrap it off easily. It would also show up in very small patches and then progress into full rocks over time.

 

[Lil'Fish]

Is this the start of coraline? It looks really stringy

Looks like you have Cyano on top of GHA, or turf algae, or maybe byprosis or some other nuisance algae.