Let me know what you think... This plant is about 7 weeks old and is under a 600W halide.. I have a few others the same age that are developing this. They are all being grown in soil

Doesn't look like overwater. Looks like a serious PH issue, possibly a nute problem. First link has a pic with overwater issue. Both links are useful for nute issues.

http://www.drugs-forum.com/growfaq/97.htm
http://greenmanspage.com/guides/tables.html

Thanks for that info.....it is my ozone generator.....right near all the plants effected.....thanks sooo much for the links bro

Yes the plants near the generator are the ones affected...I don't need to have it going so I took it out all together... I use Advanced Nutrients for fert. and my water is R.O. and my PH is good. It got a bit hot the last few days around 82F but I turned down the temp. today and removed the generator. I will watch closely over the next few days and see if the are getting better. However in the first link figure number 8 is exactly what it looks like and it is pretty much local to the area around the generator so I hope that is it. Might give them a small foliar feed of some epson salt mixture as suggested as well but I think it is the ozone. I use the Advanced in the amounts as suggested on their site and I water, water, feed. If you see anything wrong with this regime please comment....Thanks everyone!!! Love this community your all the best people out there.

yeah it's the ozone generator, they're notorious for doing that. if you're using one it's best to make a box on the exhaust that way the crap it gives off doesn't come in contact with the plants.

Looks to me like Nute Burn. And not the type from watering but from foliar feeding. If your not careful you can burn your leaves with foliar feeding, especially if the room is hot.

Yup you and OG got it. Lookin pretty big now bud.

Ozone is my bet. Can you put your generator in your exhaust line? That would eliminate the O3 in your room directly and still cover your smell issue.

Vaper