Any thoughts on my PPM question - should I be using the CF or EC scale? I have plants in the veg unit for about 5 days and I started noticing patches of bronze/copper coloring on the fan leaves. Would this be from running the wrong PPM number?
PPM and EC are just different forms of measuring the same thing... it's like deciding upon using inches or centimeters to measure the length of an object. Most meters today use 700 PPM = 1.0 ms - so 2.0 ms = 1400 ppm. Your plants won't know the difference - as long as you do!