I am only adding GH 3 part 1 -1 -1 right now. Drop of Superthrive/gal and RO water which probably doesnt have any ca/mg. What should I use? The Bloom has Mg and the micro has Cal. I am using a Hanna TDS/PH meter at 200ppm for these plants which are 24 days old from sprouting out of the RW. Does this seem like enough?