I currently have 16 plants going , 7 Bubble Gum , 5 Northern Lights and 4 Snow Whites...I am using a 76 x 76 x 76 grow tent , 1000w MH + HPS Umbrella Reflector and Digital Ballast , 6 inch 440 CFM Charcoal Filter and Duct Fan Combo Kit , I have one Big Fan blowing are around the top of the tent , and a smaller fan blowing air on the plants... This is my first serious grow , I feel like I am doing all that is possible in my knowledge to do ; everythings was going fine till about 4 days ago ( the plants are entering week 4 in a couple of days ) Some of the blades on the plant look really shiny almost plastic like and the ends are curling inwards.. On some of the other plants their is like burn spots on the tips , one plant in particular is looking pretty bad and the old leaves are rotting away but the newer ones are healthy green. Please any advice will help , anything you spot wrong let me know i included pictures of the soil ... As far as Fertilizer I am using Nirvana's Solitabs for the Vegetative stage.