HB, thanks for this thread. I've read this thread from start to finish. Took me a couple slow nights at work to accomplish the task. I'm a relative rookie, I have one half-assed grow under my belt and think I know where I went wrong. First the particulars. I'm growing Auto's, 3 gallon fabric pots, Promix + 20% perlite, 2 - 300 watt LED's with 2 more on the way, 6 in duct fan connected to a carbon filter, and an oscillating tower fan blowing across the plants, Foliage Pro and Pro-Tekt, tap water at 144 ppm. Just happened to make the choice on Dyna-Gro products based on some other things I had read and up front cost but before finding this thread. Was hoping to find a magic bullet/feeding schedule when I began this read, but understand now why its not possible. About my 1st grow. Everything was going well for about 30 days then I started getting spots on the edges of leaves and lightness between veins. From pics i've seen it looked like both Calcium and Magnesium deficiencies. I tried different PH levels thinking that they were getting locked out. That didn't help much. Bought Mag-Pro, didn't help much. Where I think I went wrong was not watering to the point of runoff and getting some salt buildup which threw everything way off and locked out nutrients. I suffered through it and harvested enough to supply the wife with meds until the next harvest. I'm on to my next grow and planning on doing MUCH better. I'm about 25 days in and so far everything looks pretty good, minus some nute burn on one of the plants. I have 2 different strains going, same age, and fed them the same (1/4 tsp per gallon of Foliage Pro on their 1st feed). Ice Cool got burnt by that amount and my Trainwrecks were showing some nitrogen deficiencies at the same feeding level. This only goes to prove that there is no magic feeding schedule like I originally had hoped I'd find. The environment was exactly the same and just the difference of which strain you are growing can dictate how much you feed. I'm learning more on how to read my plants needs and hope to triple my yield from last time. Another couple weeks should give me an idea if I'm on pace.