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I have a 20 gallon with 2 java ferns, an anubis nana (sp?), peacock moss, and a sword. The nana has some BBA that has begun to grow on it. I do not dose any ferts, or do anything special with the C02. Water changes happen at 2.5 gallons every week. Lighting is the stock fluro that came with the tank. I have had the tank for a year in August, and the last few weeks the BBA has occurred. What can be done to get rid of it? I read about using Excel, but would like to keep from adding chemicals if possible since I have livestock in the tank as well. Any suggestions?
 

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Can you give us some baseline parameters?
1) How much and what kind of light?
2) Fertilization scheme (EI, other)?
3) Pressurized CO2? Do you know how much you're getting in there?
4) pH, KH, Nitrate and Phosphate concentration?

Whether or not you use CO2, you have to get to the root cause of the BBA, or it'll just keep coming. Don't ask me how I know.
 
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