I have decided to dry dose, got this info for the potassium nitrate:
To reach your target of 7.5ppm NO3 you will need to add 1.47 grams (equivalent to 1/4 tsp + 1/32 tsp ) KNO3 to your 120L aquarium to yield:
Dose these levels 2-4 times a week for EI. Classic EI depends on good CO2, good circulation, and regular water changes. Light past moderation is not so important.
Still can't find the right info for my Doff sequestered iron plant tonic.