What kind and how do I get rid of it

[gclackum]

So I got this red brown algae only grow on top of my rock seems a little hairy

 

[billyocean]

Cyanobacteria. You can use chemiclean to get rid of it but it will come back. Usually happens when parameters get unstable or overfeeding fish..or amino. Your phosphates could be low..there's a bunch of reasons why it could be showing up. Chemicals can provide a temporary solution but the best thing is to figure out what caused it in the first place. You can shut off flow and gently brush it into a siphon with water changes. I'm sure someone here has a good solution for you.

 

[SaltwaterGardening]

Screenshots I’ve saved to answer just these questions! Slow change is better than chemical in my opinion.

 

[Seajay]

Manual removal, water changes and better nutrient management. Looks like a relatively new tank with more fish than corals, so I'm guessing parameters aren't dialed in and nutrients are high.