Peyote Gorilla & White Widow by seedsman

Plants are slightly discoloured and some brown spots are forming. Im watering with dechlorinated tap water, every other day roughly about a litre. Ph between 5.8 and 6.2. The first topping of the mainlining didn't seem to slow grow to much, aside from the colouring they seem to be healthy. I have not grown in coco before, I premixed this with gia greens all purpose and worm castings. Im not sure if maybe its from a deficiency (the browning) but hoping to figure it out. Ppm is around 200-300.