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Might just be plain ol' nitrogen deficiency. Symptoms of Nitrogen deficiency include; red stems, small growth, pale appearance to the plant, and a rapid yellowing of the lower leaves that spreads up the plant. http://www.royalqueenseeds.com/blog-cannabis-nutrient-and-deficiency-table-n88

So you post a thread saying you have a plant problem. Now you are saying its fine and nothing is wrong? Cause the buds are "exploding". Make up your mind. And now you say you have orange and yellow leaves. So you know its not just normal purpling. Keep agreeing with people saying you're fine...

As you can probably guess, it isn't drain to waste, either- but I think that's pretty wasteful so I don't do it. Instead, it's my RDWC water, pumped in and cycling continuously. Yeah, it will be a drain to waste system. From what trial and error I am doing it's not that wasteful, at all...

Reservoir outside the tent if you can do it. To keep res temps down. I would suggest flood and drain. Easy, simple and can get just as good results as any other system.

I like how rare somehow means it won't happen to me. lol Leaves turning reddish purple is pretty rare to me. I can get purpling out of almost any strain using cool temps at the right time. That doesn't look like what you have. Your leaves are almost "bronzing" more than purpling. I would lean...

Molybdenum deficiency?

Customs will send you the envelop with it resealed with customs printing all over it. If they looked through it. Happened when I tried ordering from herbies. That's IF they looked through it. You probably missed the mail man. You have to sign for some of those. You might not have seen the...

For sure. I have Ulcerative Colitis. Smoking definitely helps. I was to the point of getting i.v medication every month, Immunosuppressant's, anti-inflammatory drugs, the whole nine. These drugs had bad side-effects and even increased my odds of getting lymphoma. The worst part is that they...

Looks like a pH problem. I know you said you're checking... How are you checking? What soil are you in?

Every response will help. You looking at a drip system as well?

Recently became interested in adding some form of top feed "drain to waste" system to my setup. What I have planned out so far is just to use some spare 3x3 flood tables with 4, or 6, 2 gallon pots filled with strait coco. I will just be using a simple manifold made from 1/2 inch pvc pipe. This...

Yeah, that might have something to do with it. Probably could have mentioned that. You said you were only giving them water but not for the past 3 weeks!

You could be over-watering.

Yeah, for what you're wanting to do I would say just two seperate systems would be easiest. Two 2x4 flood tables side by side. You could have one sit a little higher also, so you could keep the younger plants the same distance from the light and keep from being shaded. Like what Alaric was...

Nothing complicated, don't over-think it. Its just a measurement of dissolved salts in the solution. A $20 meter will get you started.

That would work but, like you said, you would need two as they share the same reservoir/mixing bucket. No big deal. You could make that system for a fraction of that price though. If you want to do two systems to allow for just two different stages of growth then you could do any system you...

The run-off will usually contain a higher percentage of salts, thus giving you a different pH. Just make sure you're not getting salt build up in your soil. I'd check the ppm or ec next time. Will still be higher then what goes in, obviuosly, but just make sure its not getting too high.

Do you flush your plants before harvest? If you do it makes it challenging to run in hydro at different stages of growth. Say you're trying flood and drain, one of the most effective systems imo, and you wanted to flush 3 plants but the other 3 are only week 3 or 4... This will not work as they...

What nutrients are you using? And at what strength? Ppm. EC?

Looks like magnesium deficiency