I am having problems with yellowing spotting on my the leaves, this follows with a the leaves drying up and dying. The plants are a couple of months old and now in the flowering stage. . I am using an ebb and flow active hydro set with 400 watt lightin a 6x6 room. A co2 system also runs 24 hrs a day. The room temp is kept between 72-78 degrees at all times, the hummidity between 40-60%. PH is regularly checked and maintained between 6.6 and 7.0. . In an attempt to fix the problem I flushed the plant with plain water for 2 days and cut down on the nutrients(Fox Farm, Bcuzz and Diamond Nectar) by only adding 13 Gallons worth of nutrients in a 15 Gallon reservoir. . 1 and 1/2 weeks later the yellow spots are still spreading and the leaves are still dying. . I probably won't harvest anything worth wild on this batch, but I want to know what I am doing wrong before I begin a new set. . Any advice would be greatly appreciated.