I have vinegar/sugar dosed for almost 2 years. During that time I had a dictyota outbreak. The Phosphate ranges from 0.02 to 0.05 and nitrate is 7mg/l. It is important to reduce nutrient load but I suspect there is more to algae outbreaks than just nutrients. Nutrients are the fuel but algae also requires the right type of light to convert the fuel into mass. My suggestion would be to use a higher k bulb. I use 20k Radiums with good results.
Cheers,
Tim
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