For BGA, do a total blackout for 3-5 days depending on the seriousness. Before the blackout, remove as much of the affected plants as possible and then do a 50% water change. Add 1/8 tsp of KNO3 after the water change and finally the blackout. Make sure you stop the CO2 injection, aerate the tank and make sure absolutely no light gets in during that period or else it might not work. After the blackout, do another 50% water change and add 1/8 tsp of KNO3. Make sure your CO2 is good and dandy (20-30ppm throughout the entire photoperiod) by doing frequent changes of brew CO2 or simply invest in a CO2 tank. Dose enough nutrients for the whole week and ensure they don't run out should do the trick.
Plant Physiology by Taiz and Zeiger
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