Trim and scrape off algae from both affected leaves and tank glass.
Do a 50% water change and clean filter
Fix your CO2 and drop your pH down to 6.7-6.8 with CO2 only and ensure it stays there for the entire photoperiod.
Dose back fresh nutrients like KNO3, K2SO4, KH2PO4 and traces (TMG,Flourish and etc.)...dose another round for the KNO3, KH2PO4 and traces 1-2x more depending on amount of light and plant density. Repeat the entire routine again for 3 weeks and you should see good results. Just be anal with the CO2...dosing nutrients is easy.
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