I have the same thing. Either you don't have enough light, you have too much light, not enough co2, too much co2 or not enough potassium, or not enough nitrogen. Ino, its a b*tch to keep up with, which is why I don't =) Also, overdosing on ferts such as Seachem flourish gets the brown algae going, so refrain from overdosing on that stuff.
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