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Pod_01 has explained a lot already, thank you for filling in!
Spdjnky, like Pod_01 explained, Plus-NP would be the right product in your nutrient situation.
Usually we get reported that nitrate concentration drops when using NP-Bacto-Balance although nitrogen and even nitrate is added. A rising nitrate concentration while phosphate concentration is dropping is quite unusual. I suspect, together with the tank conditions, the organic carbon may have reduced nitrate to nitrite and the nitrite is giving a false-high concentration of nitate.
To find this out, could you please check for nitrite?
Spdjnky, like Pod_01 explained, Plus-NP would be the right product in your nutrient situation.
Usually we get reported that nitrate concentration drops when using NP-Bacto-Balance although nitrogen and even nitrate is added. A rising nitrate concentration while phosphate concentration is dropping is quite unusual. I suspect, together with the tank conditions, the organic carbon may have reduced nitrate to nitrite and the nitrite is giving a false-high concentration of nitate.
To find this out, could you please check for nitrite?