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Why do I keep getting black beard algae


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Hello everyone

I had a black beard algae problem a couple of weeks ago which I solved by using hydrogen peroxide. Unfortunately, they keep comng back and I don't know why. Could it be the nutrient imbalance? CO2 problem? I don't use a CO2 system just an air stone. Is it because of low flow, I only have an internal filter and it doesn't create a lot of flow. 

Any advice is appreciated


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