Medium is Coco/perlite 60/40. Advanced Nutrients sensi grow a +b. Advanced Nutes connoisseur a + b. B-52 Voodoo Juice Big Bud Overdrive GH Cali Magic (calmag) Week 1: 800ppm Week 2: 850ppm Week 3: 950ppm Week 4: 1100ppm Week 5: 950ppm Week 6: 850ppm Week 7: 750ppm Week 8: Flush Nutes are usually around 8:5 ratio, 8 being a and b formulas. 5 being supplements. Using RO water with 3ML of Cali Magic per gallon. PH of water pouring in 5.7 with 25% or more runoff, drain to waste style no sitting in a puddle of nute solution. Pics of two leaves are the progression of symptoms. Burnt tips and edges, leaf tips beginning to curl upward. Then progressing to rusty spots nearly all over. All plants have symptoms, some show worse than others as you can see in the whole view pic. I've seen some pics in the growers bible that suggests magnesium or Potassium as the culprit. What do you think it is? Any help is welcomed and much appreciated.
I had the same problem my first grow and ended up scrapping them because I couldn't figure it out. I believe now it was potassium.