Below are some pictures of algae in my tank. It's only growing at the top of the top rocks so I'm thinking it's just saw growing where it gets the most light. It's a brown color and makes the rocks look "scruffy". I run GFO in a reactor and a protein skimmer plus filter socks changed twice a week for nutrient export. Nitrate is 15 ppm (Red Sea) and phosphate is .061 ppm (Hanna Phosphorus). I'd like some opinions on if this looks like hair algae or is something like cyano. The tank is about 3 months old. Suggestions on how to get rid of it would also be appreciated. To be honest, I haven't tried scrubbing the rocks off but I did try blasting then with a baster but nothing really came off. My sand is clean and gets turned over/cleaned every other week with a 10% water change.
Thanks in advance!
Thanks in advance!