I'm almost 3 weeks into flowering on my first grow. I'm doing Pineapple Haze (sativa dom), Blueberry, and Strawberry Kush indoors, in 5 gallon pots with 70% Walmart organic potting mix and 30% perlite. 600W MH during veg and 600W HPS during flower. I'm using Jack's All Purpose (20-20-20) and Jack's Bloom (10-30-20). I water when the soil is dry and do 1/4 to 1/2 strength nutes with every watering (based on the package directions for feeding with every watering). My tap water is soft, but has a ph of 7.5 to 8. After letting it sit in a bucket for 24 hours and adding nutes, it is around 7 to 7.5, so I use ph Down to get it to 6.4 or 6.5 every time. Everything's gone reasonably well, but I've had a few issues with brown spotting and yellowing leaves, mostly on the Pineapple Haze plants, but with the Blueberry affected a little also. It first happened a couple weeks into veg, when I upped my dose of the Jack's All Purpose. At that time, most people thought I had a Ca, Mg, or K deficiency. I flushed and added CalMag to my regimen and the problem went away. The second time it happened was this past week when I started transitioning from the All Purpose to the Bloom formula. After reading about high P causing lockouts and looking at the deficiency pictures for the nutes that it locks out, I'm convinced I'm giving too much P (plus, I assume ph down adds P as well). So I just ordered some Foliage Pro and I'm going to try using that instead of the Jack's, at least for the next couple weeks. A couple of questions: Do I need to add CalMag or does the FP provide enough for a soil grow with soft tap water? Do I need ProTekt for a soil grow? I know some use FP all the way through flower and some, even if they agree that the need for high P is a myth, use a mix of FP and Bloom during flower (9-3-6 and 3-12-6, which would average out to a 12-15-12 ratio). So should I stick to the FP only or add some bloom to get a little more P while still retaining enough N? Any suggested dosage for the FP? I was thinking of trying the suggested maintenance dose of 1/4 tsp per gallon.