I had a GHA problem for a while. I credit 3 things with fixing it.
I don't know how old your tank is, but I added some of Algae Barn's Oceanmagik phytoplankton. They will compete with the algae for nitrogen, and they feed corals and other zooplankton.
Another thing that I did was to add a powerhead, since I definitely didn't have enough flow in the tank.
The last recommendation is weird, but I think it really turned the tides in my favor. You can spend a bunch of time trying to remove it all by hand, which takes forever and sucks. I added a trio of Molly fish (acclimated slowly) to my tank and my hair algae disappeared practically overnight.
Please keep in mind, these don't substitute for proper tank maintenance, but it can help to trap nitrogen in places that aren't the water column
(Ignore the glofish anemone. I thought it was funny).
I don't know how old your tank is, but I added some of Algae Barn's Oceanmagik phytoplankton. They will compete with the algae for nitrogen, and they feed corals and other zooplankton.
Another thing that I did was to add a powerhead, since I definitely didn't have enough flow in the tank.
The last recommendation is weird, but I think it really turned the tides in my favor. You can spend a bunch of time trying to remove it all by hand, which takes forever and sucks. I added a trio of Molly fish (acclimated slowly) to my tank and my hair algae disappeared practically overnight.
Please keep in mind, these don't substitute for proper tank maintenance, but it can help to trap nitrogen in places that aren't the water column
(Ignore the glofish anemone. I thought it was funny).