Ive been using fox farm ocean forest mixed with 30% perlite and fox farm nutes for my plants and im having some kind of def problem or lock out. I give my veg plants 1 capful of grow big and they did great for about 2 or 3 weeks then the leaves started turning real fat and dark green then here came the brown spots now they have brown blotches and leaves are dark green and dry. My flowering plants are also messing up. They did great for 2 or 3 weeks then came the brown spots and lower leaves yellowing with brown spots and dying and some mid leaves are almost covered in brown spots. I was using 1 capful of tiger bloom and 1.5 capful of big bloom mixed togeather now some of those plants barely got leaves. I went and got some Cal Mag plus and have been adding 1 teaspoon to the veg mix and the new growth is growing fast and healthy and lighter green but the old affected growth is looking worse. I also add 1 teaspoon of cal mag to my flowering mix and the flowers are growing faster but the affected leaves are getting worse.
I don't think it's a fungus because my hempy bucket plants are doing great in the same room with know brown spots. I don't have pics
im also using tap water it's around 174ppm and I feed every watering and I don't know the ph of my solution because my pen is messing up at the moment.
Any suggestions?