Hello, I'm a first time grower, i noticed recently that my biggest plant looks like its deteriorating in health, its leaves are hanging down more and doesnt seem to be growing much. The leaves used to point up. The strain is OG Kush and its 16" at least, im getting ready to flower. p1, p2 Its done that probably twice before but after giving it some water it recovered pretty fast, but somehow i dont believe that thats the case this time, since the soil is moist and the pot is pretty heavy, looks/feels watered enough. I mix my own soil, i use a mix of potting soil, bit of organic soil, vermiculate, perlite, peat moss. I bake the soil on my grill to sterilize before adding the perlite, moss, and vermiculate. My other plants seem to be doing fine, except on a couple i noticed yellow brown spots on the edges of the leaves and on the leaftips (p3 the g13 on the right), any ideas? I use a 150w hps with 2 fluorsoscent 45w also. the growroom is 2.5 x 5 x 8. temp stays between 52 - 65 ph was fine last time a checked. I use a baking soda/vinegar co2 generator Any advice, ideas would will be appreciated.