I will hazard that the algae is probably aided by nutrient deficiencies, nutrient imbalance or simply excess light (without correspondingly high CO2). If you have enough NO3 (5-10 mg/l), PO4 (0.5-1 mg/l), K (30-40 mg/l) and micros, your plants should thrive and algae will diminish.
Actually, I find yamatoes very useful with green hair or thread algae. try those???
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