you did the proper thing creating a control and bringing in a different healthy plant. no experience with it, but yea you could have some off-gassing.

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PainWrek Current 2000watt GrowLab 5strains
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I dont really think off gassing is your problem. How many plants are you growing under 12,000w of HID intensity? is it possible to cut down on the lighting for a bit n test out another plant brought in from another grow??

--Also, you say that you've messed with Environmental controls, and tried to solve the problem that way also?? Im asking because to me, it looks like light/heat burn. look at the bottoms of your plants. Still lush and green from the last pic i took a look at. But the tops are what is mostly fried. So if i were you, i'd take another look in that direction, because it cant be your nutrients, pH of your water, or any other factor having to do with what your feeding them, mainly because you say your paying attention to all of this already. So if everything on the feeding end is taken care of, then you have to look at the environment. And if the cause were Off Gassing, the leaves would Turn bright yellow, and then they would slowly die off, not getting crispy at all, but rather wilting would occur. At least with the offgassing that everybody was experiencing when Hydrohut whopped out their line of Toxi-Tents anyways, lol.

So go back to setup man. That is ALOT of light to be using in one grow room, and if your in Newbie Central looking for help, I would almost suggest that perhaps your biting off more than you can chew at the moment. But then again i dont know you, and you could be a pro for all i know, lol.

--Solutions for complex problems are too often hiding in obvious places.--

good luck with your grow homie. Hope you get up to snuff

--I wanna see some pics of this setup dude. Thats some serious firepower.

-K1.

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It's hard to tell from the pic, is the problem affecting only the top, or is the middle and/or bottom also affected? That would help narrow down if the intensity of the light is the problem.

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I'm a Consultant by day, a Ninja by night, and a Caregiver for an Oregon Medical Marijuana Patient when I'm not consulting or kicking ass ninja style.

OK, so I talked with a local expert who tells me he has heard this story recently from 3 othre people. All of which are on the House qnd Garden products (aqua flakes a and b). any of you out there have issues with H&G? The guy gave me some General Hydro products (Flora Series) to try.