its gh flora bloom and micro at 300ppm ph is @ 5.7 for my clones wich are the only affected plants. They have not rooted yet, this happened about three days after taking them. the nutes are very weak and I have never had a problem before using this mix. if you look at the pic of the leaf by itself you will notice that the brown spots are localized and the leaves are not burnt at the tip, I have never seen nute burn present like this. the growing tips are dying and drying up, turning black. I sprayed them with a mixture of 2 tsp baking soda in a gallon of water PHed up to 9.0 in case its a mold or something. I just hope its not a bacterial blight or something