Extra Phosphor to address deficiencies eliminates phosphorus deficiency in planted aquariums. The essential macronutrient FosFo is available in various packaging sizes: 250 ml and 500 ml. Easy-Life Nitro and Easy-Life Fosfo are used to correct deficiencies in nitrogen (N) or phosphorus (P). A lack of these macronutrients will inevitably lead to stunted or even stagnant growth. In planted aquariums where there are few or no fish, a deficiency of N and P can quickly arise, as little or no fish food is used, which, along with fish waste, is the primary source of N and P. This can also occur in aquariums with a high plant density. Nitro (contains nitrate NO3) and Fosfo (contains phosphate PO4) promptly replenish these deficiencies. Typically, the relationship between nitrate (NO3) and phosphate (PO4) is analyzed using the so-called Redfield ratio.