Reduce your feedings, manually remove it, reduce your photo period, keep powerheads on full and, be patient. I had an issue for about a year and I did all of the above and it slowly went away. As others have posted, chemicals are a short term solution. Reducing your bioload until it is gone will also help. I ended up getting rid of a few fish. If you take a quick approach, it will most likely come back. If you don't manually remove it, it can die off and affect your tank. I don't remember exactly what that does, but I wouldn't risk it.
It is a long, slow process. Good luck with staying patient.
I know it got the better of me sometimes.