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HELP! Help! Like no one has used that before

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DeadlyNedly

New member
Up to about a week ago most everything was cool (some yellow between the veins). Then twisted, cuping up leaves started appearing everywhere. Here's my system 8 plant DWC using General Hydro nutrients under LED lights. Air temp between 80 to 85, water chiller set to 66. I added a small amount of micro the other day to see if that would help. Started flowering about 3 weeks ago. Can't see any problems with the roots, not mushy or off color. There could be a little light burn, but nothing severe. Ph has been kept within 5.5 to 6.5 parameters. About half, maybe more, are showing these symptoms. The others seem in the very early stages of whatever this is. It really looks like they are dying or something with the leaves all drying out.
 

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If I had to guess, I would say heat and light stress are a big factor. How close is the light to the plant? Can you bring canopy temps bellow 80? How much air flow is going on around the tent?
 
I have 2 9" fans to circulate air, as well as an exhaust fan (400 cfm). I moved the lights to the top and temp came down. I think you hit on something with the light stress. Thanks, I'll let you know what happens.
 
Sorry, perhaps I should not have been so jocose. I was just pointing out the fact that you've been burning the shit out of your plants with heat/light.
 
UPDATE: Well that crop all turned yellow except at the very top of the bud. I wasn't going to try to save it (didn't know if smoking it would be toxic), so I thru everything out and started over. I germinated the seeds and planted in rapid grow units. After seedlings came up they started to turn yellow. I can't figure out what is causing it. I started some seeds in jiffy pellets and the same thing is happening on them. Please help. At this point I am still using tap water.
 

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I am using LED's I have 4 at 2000 and 2 at 1500 (watts). I found out that my pH meter was off. I think the problem is high pH. I got a new meter and found out the tap water is about 7.1. Probably so high the leaves are turning yellow. That's probably the problem from my last crop too. I also got a lux meter. With all this help maybe I'll turn this black thumb green. lol
 
I Kinda think if you put a few cfls or a t-5 over your seedlings you might see a big difference. I don't think a ph. of 7 is high enough to kill your plants. Just my opinion. Oh yeah, test your meter in a cup of milk,should be around 7.
 
Im no expert but 4x2000 and 2x1500 watts for 8 plants!? Jesus, I would settle for one 1500 and place it as high as possible! Even that might be a bit to much. From what Ive learned atleast.
 
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