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Thanks for the info. I used this one and got confused on different methods of how much to add for the mixture. Do I still need to worry about using the K2SO4? I currently use the seachem equilibrium to mix in my RO water for the GH.

I use that calculator too and dose EI daily. What I like to do is look at it from the view of how much of each fert do you want to dose in ppm over the whole week. To do this just multiply the daily dose by 7 or the EI dose by 3. You still enter the aquarium volume, however the ppm being dosed is always the same regardless of volume, only the amounts of ferts used changes in the calculator.

By playing with the calculator you can see that when you compare the 'EI Daily' method with the 'Estimative Index' method that the weekly values of ppm ferts are identical (based on 3x a week using EI). Once you figure out how much you like to dose for your setup I like to use the 'What Dose to Reach Target' method.

I believe Tom Barr's max recommended total weekly dosing for a high light, CO2 injected, heavily planted tank is about 30 ppm KNO3, 10 ppm KH2PO4, and 1.4 Traces (or CSM+B). Again this is how much you are dosing and not the values in the aquarium at the end of the week. My water is moderately hard so I do not dose K2SO4.
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