04-11-2010, 10:33 AM
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WTH... I've never heard of algae developing because of a deficit of anything (unless that deficit is impeding plant growth).
According to the limiting factor rule, the limiting factor is the element (an element essential to plant growth) in the lowest availability, ie light, CO2, Nitrate, etc. So for example by the rule of limiting factors you could have all the lighting, and ferts in the world but if you arent providing enough CO2 the plants will still grow at a snails pace.
What I am getting at is that perhaps this deficiency in nitrates is limiting your plant growth which in turn is leaving an excess in other nutrients which then feeds the BGA?
In any case you can add nitrates to the tank by dosing KNO3 (potassium nitrate) which is a dry fert dosed according to the estimated index.
I recommend that you move this to the planted tank section though and give us all the stats of your setup including lighting, plants, etc. I'm sure there are simpler solutions to your BGA than adding more nitrate (which could simply bring on different algaes like GDA).
Last edited by aunt kymmie; 04-11-2010 at 11:24 AM..