New growth curling down and yellowing between leaf veins...this is magnesium, correct? I transplanted my 2 clones after 3 weeks in 3" starter pots into 3 gal. pots with fox farm ocean forest. I've been watering them with RO water at 6.5 to 6.7 with a little under the recommended amount of cal-mag...around 2ml per gallon water. Only 1 plant is showing signs, they are under a Sunmaster Sunblaze 20,000 lumen blue florescent light at 24" above canopy. They have been fine up until 4 days after transplant, then started noticing the yellowing at first and new growth started drooping yesterday. I'm just confused if I'm supplementing cal-mag because of RO water, do I need more or is it a build up?