This will be my first growing experience, so any advice would appreciated.. preferably good advice, though. Anyways, I have hydroponic indoor setup.. 600w hps, with 5 purple power clones. I have only had the clones just over a week, I got them in their second stage of growth and when I recieved them they looked very healthy despite being in shock from the move, they only had a few burnt looking (yellowish) tips on a few leaves. For the first week they had been on 24 hour lighting with watering 15 min every hour. They were growing at a healthy steady rate, but then I noticed that tips of the leaves began to turn yellow on all of the plants in various places. The first thing I did was add nutes that I had been planning on adding, just was difficult to get ahold of them. After a couple days of the nutes being in the water they continued to get even worse than before adding nutrients. Since the plants have been going downhill so quickly I reacted by changing as many things that I thought it could possibly be. I moved them further away from the light, flushed the water to lesson the amount of nutes, added a fan to help keep cool temps in the hot/dry area, lowered the watering to 5 hours per day, and the lighting to 20 hours per day.. I even added epsom salt to increase Mg. These plants still look fairly healthy, and I believe they are probably saveable.. But I need some good advice fast! I can post pics later on if need be, but I really just need some help. I have had these clones for 8 days now, and have seen drastic unhealthy change. I just made all those changes listed above yesterday (May 20). Symptoms include; Yellowing of leaves (mostly tips), curling leave tips (getting black and dead), and brown/black spots in various places. Any suggestions?