Manually remove as much as possible. Sometimes you can twirl a toothbrush around and pull it out, like spaghetti. Reduce the amount of time your lights are on.6-8 hours is a good range.
You can try doing a 24-72 hour blackout. Dose some extra Seachem Excel during the blackout if you have it. Throw a couple of water changes in there.
If you have a test kit. Test your Nitrates to see if you're adding too much Nitrogen. A good range would be 5-10
You need to have a good balance of light, co2(carbon), and nutrients to avoid algae.
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