A few weeks back I built a pure fog system. Plz no suggestions about switching to a new method. I have my reasons for doing fog. At any rate, about 4 days ago I dialed in the system and was getting really good growth and nice green leaves. 3 days ago I decided that the water was too dirty and that I should probably lower the ppm's in the water anyway, so I changed it out. I believe I took too long on the water change which was probably in the neighborhood of an hour. I wasn't careful enough with the bottoms of the cups as I ended up brushing some of the roots which caused several of them to start to brown and shrivel up. I have been having problems with root development but that is in the past. The roots are developing nicely in mass and they are hairy and white. At the time I changed the water I also lowered the light hood which I also believe was a mistake. After a few hours the leaves looked even worse. I think the light was too low at only a few inches off the top of the canopy. I just read that for a 600 mh light I should be about 18 to 24 inches away from the tops. That's been fixed.

There are other things I did wrong I'm sure but I will post a few of my activities over the past few days in hopes of someone spotting something:

1) changed water and left plants out of fog for an hour
2) lowered ppm's to around 400 to 425 from about 550 to 600 previously. My water source is 225 right out of the gate. I will eventually install a water filter at my source.
3) lowered 600 mh light from around 2 feet to about 4 inches from top which then caused the heat to rise to about 84 degrees before I finally had enough and raised light to 20" from top of canopy.
4) installed a new fan today to help lower temps which is just blowing across the top of the canopy.

Current measurements:
425 ppm
5.8 ph
83f water reservoir
79f plants
600mh 18/6 cycle now sitting at 20 inches above canopy
30ml in a 15 gallon res of root hormone
Fog timer set to 90 seconds on, about 5 minutes off. I continue to worry about not giving them enough moisture. The drooping leaves would indicate not enough water wouldn't it or too much light/heat?

Something to keep in mind is that what you see in the pics has been caused by many different mistakes on my part. I know leaves are falling off the bottom but don't use that as part of your diagnosis. I know that I likely burned them as well with too much fert in the begging, but what I don't know is whether I am continuing to burn them, or are the leaves just showing scars from the damage I caused earlier? About a week ago I had the light pretty high and was under the impression that I should be lowering it every couple days until it's a few inches above the canopy. Is it possible that my current issues are from me lowering the light too much? Given that the light is in the right place, assuming 18 to 24 inches is correct, will the leaves return to full green or will they stay yellowish? What else can I do here? Lower ppm's to 300 maybe and for how long?
Prodaytrader Reviewed by Prodaytrader on . What now??? A few weeks back I built a pure fog system. Plz no suggestions about switching to a new method. I have my reasons for doing fog. At any rate, about 4 days ago I dialed in the system and was getting really good growth and nice green leaves. 3 days ago I decided that the water was too dirty and that I should probably lower the ppm's in the water anyway, so I changed it out. I believe I took too long on the water change which was probably in the neighborhood of an hour. I wasn't careful Rating: 5