I have 100 gallon tank with 6 discus. The tank has been set up for almost 2 years. The sub is mineralized soil caped with sand. The tank is set up as low tech so not CO2. The light was 4 t8 6500K and one planted tank bulbs. Filter is xp4 and sponge filter. The tank was doing great for a year. I started to get some algae out break about 6 months ago but was under control then it started to get worse. Water change was every other day since i kept discus and the water parameter showed no problem. I thought the plant needed better lighting since the plant growth was minimal vs the algae so i purchased 2 fennex planted+ 24/7. The new light was set on the 24/7 mode. The algae problem started to get worse after 2 month under the new light so turned one off. Now its out of control, i'm scraping off algae from plants, background and every glass. The more i scrap the worse it gets. I had to take out most of my stem plants to fight back the algae. I'm so frustrated now that i was going to start fresh but need to sell the discus first. i posted the fish for sale at DFWFISHBOX and as of today no interest. I don't want to sell the discus but i don't know if there is anything i can do without breaking the tank down and start new.