Hey GC, I have noticed one of my plants has brown spots on its leaves between the veins kinda, so i can't quite put my finger on which sickness it has. I thought of high levels of ph, which I check and was at 7.0. I flushed the water and changed it out with RO water and set the ph between 5.0-6.0. Other cause too much nutes, nute burn? When I changed the water yesterday I changed out 10 gallons and added 1 teaspoon per gallon of the GH Florabloom, Floramicro, and Floragrow. Before that was about 1 1/2 weeks ago when I had 9 gallons of RO water with 1/4 teaspoon per gallon of nutes. Timer for flood and drain was set at 3 times a day every 8 hours. I just set it yesterday for 4 times a day at every 6 hours. One other plant has different color tips. This is cause not enough magnesium or nute burn as well? Please help me out GC.