Planted tank KSA

Black powder/cotton like stuff in my planted tank on the 3rd day, fighting it with water co2, decreased light hours and 50% water change daily. Good for Beginners like me. Aquarium pH: 6.5 – 7.5, and some suggest that pH as low as 6.0 is acceptable. Water Temperature: Tropical fish range, 72 – 82 Degrees Fahrenheit. Lighting: Moderate to strong, and for between 10 – 12 hours per day. (currently, 6 hours with 1-hour break in lunch) Livestock: Nerite Snails (local Dammam KSA) Plant: Amazon swords (local Dammam KSA) Plants scientific name: Echinodorus grisebachii Light: SUNSUN 400c 13w (Ali Express) (Also available locally Dammam KSA) (https://www.aliexpress.com/item/32813537145.html?spm=a2g0s.9042311.0.0.27424c4dmdYNpD) Soil: the localy purchased a variety of aqua soil Note: This is not a how-to video. Please use the items/suggestions mentioned in the above description at your own understanding and responsibility.