I'm an admitted total novice to cultivation, and I am struggling right now with a couple of plants that look magnesium deficient. I wanted to know if someone could be a friend and tell me if I'm preparing and feeding my nutrient solutions correctly. First, I'm using General Hydroponics Flora Duo. Here is the feeding chart. I'm following simple drain to waste. http://generalhydroponics.com/site/gh/docs/feeding_sched/GH-FloraDuo-DTW-Charts.pdf Second, I'm using a mixture of 75% cana coco and 25% perlite in five gallon pots. My plants are about a month old and were started from seed in rockwool. I feed about every three days, and alternate watering and feeding so water-feed-water-feed. I wait till the pots feel light, and carefully break up the top layer of medium with a fork. Then I water with a mister and by pouring from a cup, and stop when I see it run through the bottom of the plant. I make my solution by starting with RO water and adding my nutrients with a dropper. This week was 7.5ml of Part A, 2.5ml Part B, 2.5ml Rapid Start, 5ml CaliMagic, and 10ml of Liquid Karma per gallon of RO water vegetative solution. Then I check the PPM's with a meter. It was about 1000. That seemed high, so I add distilled water until the PPM's are about 750. Then I test the pH with a meter and adjust with pH up or down until I'm at a solid 5.8 every time. Usually it's too low and I need to add only pH up. Then I check the ppm's again and feed. Is this right? I'm thinking that this might be the cause of my deficiency, because my plants are getting fertilizer at half strength and more water, and that maybe I should cut out the liquid karma altogether and just go Part A, Part B, CaliMagic, and Rapid Start and I'd end up in the ballpark of the ppm's I need without diluting further. They guy at the store says I should be able to feed-feed-water and that my plants would do better if I had about 30% runoff than just stopping watering when I see it come out the bottom. Any thoughts?