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phychotron said:
Those spots look like they might be cal/mg deficiency. What ppms are you running your cal/mg at?

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phychotron said:
So there was only cal/mg at first, now you've added some nutes... sounds like something was deficient. I somehow missed that when I read it. Your plants are big enough to need nutrients if you want them to grow. Once a leaf is damaged it will never recover, you have to watch the new growth and how it responds. You should see a surge of growth now that you've fed them.

Nutrient burn starts at the ends of the leaf. The tips/points turn yellow/brown and it starts to recede down the leaf and you can usually see it coming on unless you torch the plant somehow. Everything else is usually a deficiency of some sort.

If you have the space and time take a tester plant and feed the shit out of it till it dies. Likewise take one and cut out its food supply and watch how they respond. Learn the plants limits on ppm's and see if its worth going to the max before you burn or if you can go with 20% and get similar results.

I've noticed that some novice growers underfeed to avoid nutrient burn and then think they have overfed and burned their plants when they show leaf damage.

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yea I think I waited about a week too long to add nutes to my resovoir, and when I did I think the ph was a little to high, I got the ppm dialed in to 500-550 and adjusted the ph to around 5.5 and so far so good, not seeing any progression of the yellow spots or drying of the leaves. heres some up to date pics.

comments, and constructive criticism welcome, these are almost exactly 4 weeks from seed so let me know how they are doing, the smaller on the left is blue mystic autoflower, the bigger on the right is wonderwoman.