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Flourish Nitrogen: http://www.seachem.com/Products/product_pages/FlourishNitrogen.html
F. Nitrogen contains nitrate and ammonium for nitrate sources. Their website says to double your nitrate reading for a good approximation of the total nitrogen.
"Flourish Nitrogen™ is a concentrated (15,000 mg/L) blend of nitrogen sources. It provides nitrogen in both the nitrate form and the plant-preferred ammonium form. ... Because one-half of the nitrogen in Flourish Nitrogen™ is from nitrate you can get a reasonable estimate of nitrogen levels by doubling a nitrate reading, ..."
F. Nitrogen contains nitrate and ammonium for nitrate sources. Their website says to double your nitrate reading for a good approximation of the total nitrogen.
"Flourish Nitrogen™ is a concentrated (15,000 mg/L) blend of nitrogen sources. It provides nitrogen in both the nitrate form and the plant-preferred ammonium form. ... Because one-half of the nitrogen in Flourish Nitrogen™ is from nitrate you can get a reasonable estimate of nitrogen levels by doubling a nitrate reading, ..."