I test frequently for NO3 and PO4; just my nature.
Limitation of organic carbon vis a vie NO3 and PO4 is presumed as a basis for organic carbon dosing. Heterotrophic bacteria use all three( C,N,P) and can be limited by a lack of any one of them.The commonly referenced ratio is the Redfield ratio based on measurements Redfield performed on phytoplankton at 116parts C to 16 parts N to 1 part P. This exact ratio varies from organism to organism but the Redfiled ratio provides a good perspective on relative concentrations of these 3 nutrients in marine life.
In a fed tank there is little chance for a P limitation. Surface reef waters hold only about .005ppm . Nitrogen deficiencies may occur with carbon dosing but again in a fed tank it's unlikely since the food will add it as it breakdown and surface reef waters hold only about .2ppm. Some dose amino acids like aspartic acid as an extra nitrogen source and other percie ved benefits..
Limitation of organic carbon vis a vie NO3 and PO4 is presumed as a basis for organic carbon dosing. Heterotrophic bacteria use all three( C,N,P) and can be limited by a lack of any one of them.The commonly referenced ratio is the Redfield ratio based on measurements Redfield performed on phytoplankton at 116parts C to 16 parts N to 1 part P. This exact ratio varies from organism to organism but the Redfiled ratio provides a good perspective on relative concentrations of these 3 nutrients in marine life.
In a fed tank there is little chance for a P limitation. Surface reef waters hold only about .005ppm . Nitrogen deficiencies may occur with carbon dosing but again in a fed tank it's unlikely since the food will add it as it breakdown and surface reef waters hold only about .2ppm. Some dose amino acids like aspartic acid as an extra nitrogen source and other percie ved benefits..