This is my first run using jacks, I settled on 1.2EC of jacks 321, 1ml of protekt, 0.5ml calimagic, and 0.5ml of gs plant foods kelp extract. Works out to 0.2-0.3EC of additives. 1.4-1.5EC total. More than 1.2EC of jacks gave them tip burn.
I also have a way to measure PAR for the first...