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Hey,

This algae has begun to grow in my tank, No Co2. 2x39W on a 38 Gallon. I dose with excel everyday and API leafzone weekly.


How do i kill it?
 

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You have enough light to require that you use pressurized CO2. And, that you fertilize so as to have non-limiting concentrations of all of the nutrients, which generally means using the Estimative Index method. Leaf Zone is just potassium and some trace elements. You need to provide nitrates, phosphates and potassium, plus trace elements and CO2 if you want to use that much light.
 
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