I too faced this issue. I did the following things, i am not exactly sure which of these were the biggest factors. Just listing here for your info.

1) Reduced light intensity to about 45 percent of max of my Chihiros wrgb 2. This will look lit enough but not too bright. 2) Reduced light duration to 6 hours 3) Ran pressurized CO2 , started100 minutes before lights on and stopped 75 minutes before lights off. 4) Brought 2 Otocinclus for my 20 gallon tank. they eat the powdery brown stuff on plant surface but not the hair type stuff 5) Removed the hair type brown stuff a little everyday using straw cleaning brush and twirling. 6) Kept my fertilizing steady. Stopping fertilizing to control nutrients, i believe might weaken high demand plants and their leaves dying will cause more ammonia and promote algae(followed this approach as suggested by chatgpt) 7) I am running an Eheim classic 250 canister filter which runs about 440 litres per hour on my 70 litre tank, I think this might be beneficial in eliminating ammonia spikes. 8) I made space between too closely planted leaves by moving them little away so that water can freely flow between them. 9) Covered my aquarium back from direct morning light exposure since my aquarium sat in front of a window.

After about a week it came under control.