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I think the best way to get rid of green water is by reducing the amount of light or the length of time the light is on, or both. Also crank up the co2 a bit. Follow that with lots of waterchanges, at least 25% a day until it's clear and then for about a week longer, and clean your filters daily during this time as well.

**I do not suggest doing a "blackout"**, it will just lead to a lot more problems, you would end up losing some of your plants and when the mushy little leftovers of them rot in the tank they will cause a nutrient spike which will lead to another green water outbreak. You'll be right back where you are now, only with fewer plants.
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