Is this GHA ? if so how can I remove it ?

[kwang0429]

I noticed I started to have those brown/green hair algae growing on my live rocks, is it GHA ? Cyano ? Dino ? Can some of you experts please help me identify it and help with a solution? I have had my tank set up for about 6 month now.

Thanks.

 

[KrisReef]

Looks like all three. Welcome to the ugly stages. It means you are reefing.

 

[kwang0429]

Phosphate at 0.14ppm
Nitrate 0.9 ppm