Its caused by low CO2 if high light and fluctuating CO2 levels in low light setups.
BGA is caused by low nitrates. If its BGA you have the best way to add nitrates is to visit http://www.bestaquariumregulator.com/ferts.html and order some ferts. Nirates won't be the only thing you want as by adding them you'll need to also add other ferts to keep balance.
Seachem's Excel is excellent at removing BBA, plus your plants will love the Carbon source.
And to add the other macro ferts, checkout www.aquariumfertilizer.com , a 1lb. bag of KNO3 (potassium nitrate) and KH2SO4 (potassium phosphate) will run about $14 shipped. That should easy take care of the big three for a year+.
And to add the other macro ferts, checkout www.aquariumfertilizer.com , a 1lb. bag of KNO3 (potassium nitrate) and KH2SO4 (potassium phosphate) will run about $14 shipped. That should easy take care of the big three for a year+.
Best resolve IMO; Acquire some KNO3 from here, here or here.
They will all come with mixing and dosing instructions.
I find it easier to measure out dry and mix in DI water.
Then dose using a 40ml syringe.
I mix 5.5 level tsp. of KNO3 into 250ml DI water and shake aggressively Dosing - Each 1 ml of this solution will raise nitrate in 10 US gal by 1 mg/l. Target for Nitrate = 20 mg/l - so use 10 ml for every ten gal of water. If you add 5 mg/l of nitrate your tank you will also raise potassium level by 3 mg/l ( or 6 mg/l if you dose 10 mg/l of nitrate).
My nitrates are at 20 right now. Ever since I replaced the bulbs in my light fixture a couple of months BBA has been a huge problem. I've tried adding in some nitrates but I haven't yet tried Excel.