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I have been struggling with this for months. I pull it out by the handful every week. It has taken over everything. Can anyone tell me how to get rid of it? It appears white and stringy. When I pull it out it has a rough feel and is green when clumped together. Even though I try to get it all, it still comes back as strong as ever. I have tried lights out, fertilizing, not fertilizing, CO2 fert to 6.0 pH, non-CO2 to 8.o pH. Not sure what else to try. Lighting is 2-4' T5 HO and 2-4' Actinic. Tank is a 90 gal.
Try the hydrogen peroxide test. Hit it with hydrogen peroxide from a syringe. If it is a type of fungus, it should die within hours of being hit. If it is Spyrogyria , then the a few repeated shots of HP may weaken it enough to kill it. When I first set up one of my tanks, this stuff materialized in my tank but it was not as bad as your outbreak. I hit it with some hydrogen peroxide. The hydrogen peroxide(few repeated shots over several days), appeared to weaken it and it eventually went away.
 
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