Day 36 and the plants are now 16,23 and 24 inches (left to right) and have almost stopped vertical growth, resin is just visible. The tallest has some cal def spots but the other two are fine. Today each got cleaned with a gallon of 10ml sledgehammer followed by a gallon of 5ml cal/mag extra both at 6.7 ph. Leds are at 12 inches. I think I have gotten the medium right, I had used 1/3 of a cup of lime in 5 gallons of Pro-mix BX but the medium kept returning to a 5.8 ph when dry so now I have a half cup and it seems to be keeping the ph above 6. Next grow I will use more lime and maybe some other stuff. I don't want to get into making a super soil but I am tired of these damn spots.