My dosing regime is this:
Day1: 50% Waterchange then, 1/4 teaspoon KNO3, 1/8 teaspoon K2SO4
Day2: 5ml Flourish
Day3: 1/4 teaspoon KNO3, 1/8 teaspoon K2SO4
Day4: 5ml Flourish
Day5: 1/4 teaspoon KNO3, 1/8 teaspoon K2SO4
Day6: 5ml Flourish
I used to also does 1/8 teaspoon KH2PO4, but i have lots of fish poop in my tank and that gives me heaps of phosphates. I only dosed heaps of KH2PO4 to combat GSA, but after a while, my tank developed heaps of staghorn, hair and BBA.
Last i check my readings were: Nitrates around 10ppm, Phosphates around 2ppm, and CO2 is about 50ppm.
I'll recheck these tonight.