+1 all of the above.
I recommend to up your water changes to x2 per week for a few weeks, remove as much of it manually as you can (then do a water change afterwords), use less lights for a few days, only use RO or distilled water, use phosphate remove and feed your tank a little less for a few weeks until the algae is gone.
Be patient because you wont see results within days, give it a few weeks, stay consistent and you will win the battle. :Cheers: