Looks like Cal-Mag deficiency I was combating for a while. I flushed and then watered with CalMag+ as per label and my plants started to green up in a day.

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aquanaut Reviewed by aquanaut on . Help a guy out please... Hello all... Me again. Having a problem with the crop. I dont know what it is. I am using a mix of Black Gold soils. All organic. Water is around 6ph. Under a 400w light about 20 inches to 24 inches off the canopy. They are in 5 gallon buckets. I use Humboldt Nutes all organic series. I think thats all the basics. As you can see from the pictures, The stems are a deep purple. The leaves are turning white starting from the middle of the leave by the veins. There was no new growth for a little Rating: 5