Please Help, Plant sick? Dying?

Hey guys,
So I am a noob but have done quite a bit of research. This is my first grow and it went OK I guess....well up until now. My poor plants haven't had the best life because I was not prepared and kind of "learned as I went". But anyway, I have 'em in flower (not sure how long though- I failed at keeping dates/timing) but at least a few weeks. They seemed to be doing good but lacking light I thought. They were under HO flouros most of their life. I just recently put them under an HPS. They are in Fox Farms soil and get tap water that sits out for a few days. The soil PH seems in the 'ideal' range (I have a meter but it don't give digital readouts but the pin is between 6 and 7) I didn't think it was the PH because my other plant looks completely different and much better. I thought maybe a nute deficiency? Mag or cal? Not sure though. But only the big fan leaves look like this, not any other ones. Please help. Can she be saved? Thanks in advance.

Ouch, looks like you might have several problems.
http://www.marijuana-seeds.net/Thanks-ThankYou.htm

http://www.growery.org/forums/showflat.php/Number/234999

Good luck.

When you went from cfl's to hps the temps jumped up causing this, get the temps down to 80.

I don't think its that because it has only been a few days since the HPS and they were already looking like that. I don't think the temp is over 80 where they are. The heat from the light is not contained.

Hey man, Just wondering, do you have a fan or good ventilation?? when changing floros to hps, there are temp changes, and if the air flow isn't happening and temps go up, its pretty shocking to the plant, it happened to me on my first grow, good luck bro

i have been growing plants indoors for a long time bro, and your problem is shock. keeping it under fluorescent lights made it stock up on light maximizing cells. when you put it under the scorching rays of that hps, it burned like a goth kid at the beach.

if you make a dramatic switch like that on a mature plant it's gonna wither. the same thing happens if you winter your outdoor plants inside. when you plop them outside in june, they get raggedy. i let my sheltered plants acclimatize by putting them in shade when they go outside, or for the very delicate ones, i put em under a tent made from a white bedsheet for a few weeks.

you should dramatically increase the light in your clone/mother room, to reduce shock, and keep more space between your plants and hot lights at first. when you first go under hps, keep the lights high, like 2 feet, then slowly ease them lower as the plants grow, till you hit the 10" range. alternately, dont veg. send yor cuttings straight from the cloner to the hps while your big plants are still in there. your lights will already be high, and the new lil babies will get time to adjust for these plants, RAISE THE LIGHT!!!!! and trim off the burned growth, leaving only healthy leaves. burnt leaves are an invitation to disease. dont be tempted to fertilize or water more, give them time, and consistent feeding.

I have a few clones that look yellow and some of the leaf edges are 'crispy' brown and dying. It's only happening to a couple of the smaller ones, the bigger ones look fine. I'm using potting soil and a 600w MH about 18" away from the top of the plants on an 18/6 cycle. Could they be light burned? Too hot? When I stick my hand under the light it seems fine, not too hot for me anyway. I have a fan blowing onto the light and it hits the plants too, so they shouldn't be too hot, but they are still struggling. I might have been overwatering them, though. Also, one of them is in a soil I added too much compost to, and I think it's burned because it is a lot smaller and yellower than the rest. Should I ease up on the water and transplant the one that's in too hot of soil?