Seedsman Northern Lights (Auto).

December 18th - As the rest of the plants have now shown pistils, I've labeled this the start of flowering. Some of the plants are showing what I believe to be deficiencies, but I'm not really sure what is causing it. I've tried to document as much of the details as I could. It looks like it could be Calcium or Phosphorus deficiency. My uneducated guess is that either there is some lockout occurring due to pH fluctuations and feed water pH, or the plants are hungier for P due to going into flowering. I did a couple soil slurry tests by mixing a bit of soil with distilled water and one test with tap water, and the pH came out to 6.8 on the probe. The pH of the water going in is pretty low at about ~6, and then then with ~25% runoff, the pH of the water is higher at 6.8. Does this mean that my soil is actually very alkaline, potentially causing the lockout problems? Below are the feed and runoff details. I also gave a foliar spray to the leaves that were showing brown spots, thinking that perhaps the spots were due to Calcium or Magnesium deficiencies. Number 4 has had these shiny "slug trail" looking things developing on it ever since like week 2 or 3. Every once in a while I'd see something crawling on a leaf, but it was hard to see it without the use of a loupe. I believed them to be thrips. Although there doesn't seem to be any damage from them, nor an infestation (just a rare sighting here and there), I bought some neem oil and plan to give it a spray. By the way I've pretty much given up on Number 1 but I'm still feeding it, but not giving it too much concern. It's still got no branches or any type of development at the calyx areas. Weird. Feed Details: Start: 24L Start pH - 7.36 Start ppm - 50 Cal Mag Addition - 1ml/L post Cal Mag pH= 7.31 post Cal Mag ppm = 225 GMB Addition - 1ml/L post GMB pH = 6.04 post GMB ppm = 530 Plant Runoff Details (Ph/PPM) 1 - 7.04/500 2 - 6.93/1430 3 - 6.86/1300 4 - 6.88/1030 5 - 6.90/1100 6 - 6.77/1300 8 - 6.84/1130 9 - 6.75/1540