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Another trick is to manually remove as much algae as you can during water changes. Use a toothbrush for stubborn spots on hardscape. It's tedious but effective. How's the flow in your tank? Poor circulation can create dead zones where algae thrives.

Reducing light exposure is key. Try cutting back to 6 hours a day and see if that helps. Also, floating plants like Frogbit can shade the tank and outcompete algae for nutrients. What's your current light schedule?