It's nitrate not nitrite!
Get pottasium nitrate (KNO3). I have a tau-hway tub of it FOC if you want, pm me. Dose perhaps 1/4 of a teaspoon twice a week.
BGA is triggered by almost-zero levels of nitrate(which means your plants are really using up all the nitrates in the water). BBA is triggered by unstable/insufficient CO2, not BGA.
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