I'm using this calculator to determine the quantities for my stock solutions for EI dosing:

https://www.thenutrientcompany.com/aquarium/calculators/ei_calculator/

My tank is 32 gallons, dose volume is 30 mL, stock volume is 0.9 L and I'm dosing 6 days/week.

The calculator tells me that I should add 56g of KNO3 and 16G of KH2PO4 for the macro solution. The problem is that I think my fish are providing enough nitrates on their own, so I don't need to supplement my tank with additional nitrates.

If I just wanted to add potassium and phosphate with KH2PO4, how much would I add and how would you determine that? I imagine it should be more than 16g to make up for the missing volume of KNO3. On the other hand, is that missing volume so minute that the difference is irrelevant?

Thanks for the replies.