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Even though you stated your ph, it does indeed look like a low ph issue. If your using a digital ph meter I would suggest you calibrate it. You have any pics of your roots?

Problem Solved............lol, over watering. Leaves Curl in, stems and veins are purple red. Probably is deficiant due to being constantly saturated with water water causing nutrient uptake issues. Now I know when to water....... 4 freaking years I've been doing this.

You dont want to have blue or red lights on during dark hours. Green light is okay though, they cant use it.

Here is a tutorial: http://espanol.video.yahoo.com/watch/6007532/15618581 the video is in english

I change my resivores every week on the spot, over time the nutrients bind together and the plant cannot absorb them. Buffering PH means adjusting acidicy of the water. For young plants, the ph needs to be between 5.8 and 6.0. As they get older they can tolerate a range of 5.5 to 6.5. Most tap...

Hehe, thats normal.

i think it's a micro nute. Im not currently using any macro nutes with soil. In aero I use Dutch Master Advance Grow A&B Dutch Master Advance Flower A&B Botanicare Liquid Karma CalMag Hydroplex Sweet Raw Superthrive All used according to containers directions...

Here is a video of my situation. http://www.youtube.com/watch?v=CAqGPa8EXDI

foliar feed every three days using 5ml-1gallon Liquid Karma and fertilize only weekly using same concentrations. I like you persistance, really comes in handy. I just got over a really bad mite problem and am currently using neem treatment weekly.

Temps during the day never get above 80 F. Winter is currently here so I had to put timers on the intake and out take vents. The intake out take fans are on a 12/***12*** cycle. They turn on at night every hour for 5 mins. Stays about 64-72 F at night I water every 2-3 days depending on like you...

your light might be a little close. try raising it about a foot. Transplant shock and or Heat Stress.

I'm having the same problem. my thread https://www.rollitup.org/marijuana-plant-problems/385665-necrosis-all-soil-plants-some.html

Checked all My soil plants earlier today. All but 1 were in the proper range. As for aero, i've got an intellidose auto doser (properly callibrated) displays the ph and ppm 24/7.

Looks like you ph is fluctating too much. Change resivore water add nutes and buffer to 5.8-6.0. Make sure your ppm's are at 400-500. All in all you ph is off. It needs to be between 5.5-6.5 al all times.

Your HID HPS light is too close bring it up about 3 feet. Personally, where your at right now, I think you should be using cfl lighting until the plants get about twice the size they are now. Are you using Aero hydro or soil? What nute are you feeding them and how much.

Are you pumps working correctly (Floods and drains about every 30- 60 mins. You should put the light as high as you can get it for a couple of days so they can get used to the different light. I've experienced this before. Honestly, I think you should continue using cfl lighting on them until...

Overwatering and or Ph issues. Flush em. Soil needs pearlite.

Could be heat stress and or lack of water. Try moving the light up a little higher. + Can you get a pic of the plant under normal light, I cannot tell if they are yellow or green.

Now that I finally got rid of the spider mites other issues are becoming more noticable . For soil i'm using Black Gold Potting mix and 5ml-1gallon of Liquid Karma. I also foliar feed with the same 5ml-1gallon of Liquid Karma. For mite prevention I use Neem Oil, following the bottle direction...

What do you think Stinky Attic?