Hi im Adam. I have a indoor 6 site dwc system. Been growing indoors every winter. No outdoor. No soil and 1 run a year. 4 different strains. Chemdog,zittlez,Gelato, blue dream from nirvana seeds. I am having an issue and could use some help please pic of grow and pic of problems.
Hi Adam & welcome to Percys 
1 of two things I think...calcium deficiency or Ph issue
What is PH of res ? and are you using LED, if yes, are you also adding calmag to your feeds...
This is based on a soil grow though, never done DWC
Edit : ok, lol 2 questions answered...the calmag one then 
@adamman28, Hey Man, All I got is, looks like your pushing the nutz which is normal, and your in flower. I would check the PH and I would put it up to about 6.2, that the PH that plants take in MA/Cal, and at this stage that's what they want. You can have it in solution but if your PH is low they can't take it in. Anyway that's all I got from a pic, shouldn't hurt. Hope it works out. Grow On.
I try to keep res at 5.8-6.2. I am using led. First time using led. Mars hydro ts3000. Yes i was using half strength cal mag.plus its in my base nutes
First time using led
This is most likely the root cause as led lights are more likely to stress the plants into needing more cal/mag uptake. One way to help the plants with this is to apply a foliar application of Epsom Salts right as the plants are flipped to flower at a rate of 1 teaspoon per 3 liters of water. This delivers a dose of magnesium directly to the leaves which helps facilitate uptake of calcium to make chlorophyll and protect itself. The plants are already in bud now so that’s not a good idea at all. Tighten up on the ph range to the 6.0-6.2 range and they can take up calcium and phosphorus more easily as WoodI2 mentioned. Lowering the intensity of the lights can help too, it’s a narrow zone between just perfect and too much and a meter is very handy to adjust things with. Hope some of this helps mang.
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Thank you im making up a new res in the 700-800 ppm
And lowered light st. To 50% and ph at 6.2. Will give it until morning
@adamman28 would like to see what happens. The damaged won't repair but like you say, give it a little time and they'll probably look brand new. I fried cola's with LED's, ran out of room. Good Lights.
@adamman28 Nice! Title: Another Day In Growing Weed, The last entry wrote in my log last night stated "they have never looked better", this morning I freaked because they all looked DEAD! WTF! I have just three Orange Sherbet auto that are suppose to be big sativa and I am looking forward to trying to tame the big monsters. That's why there's only three. Just three weeks old too, oh and in a new system that is doing great, oh and trying my first sterile grow with CC nutz. Here I thought it was going to be a nice quiet Sunday. So dump and wait. I've never seen them wilt like this, amazing. Well This grow has been very delicate, oh well , guess I've got something to do today. I thought I would be kick back like you today. good luck
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