got three pretty little girls goin, or i hope theyre girls anyways. have one 24 inch 75W lights of america flouro grow light with a makeshift cardboard n foil reflector, plan on getn at least one more of them next weekend until i get enough extra for the 400w mh and hps kits. theyve been doin beautifully up until about 4 days ago. they are 1 month old btw. for some reason i bought mg potting mix and mg liquid all purpose plant food. so a couple of days ago, i noticed the two bottom spear shaped leaves were drooping down pretty low on the smaller two. they then proceeded to turn yellow and on one completely folded over at the stem. so i cut them off. now two of the top leaves on the big one is starting to turn yellow, starting at the tip on one n the side on the other. looks and feels like its been burnt. n the smaller two have spots n some yellowing. it stays between 68 n 75 in my house. got them in my bedroom, which brings me to ask if cigarette smoke will kill them? i changed out the soil in case i over fertd n got some 3% peroxide and mixed about 1/2 cup in a 2 liter with 6.8 PH water. recently put a fan on them. have been keeping on a 10 hour photoperiod. im sorry this is so long but ive been doin alot of searchn n researchn n got all kinda scatterd info. any thoughts on the situation of my babies would be so greatly appreciated. also, should i get two more lights rather than just one more until around the middle of next month when i get better bulbs??