What are these brown spots?

Here is Amnesia. She was the small one with the brown spots on her leaves. Now I can barely see them and her new growth is nice healthy and pretty green. And her roots are coming in.
 

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The most impressive of the few is the auto AKxDiesel cross. She has really been growing and flourishing.

You can see where the spots were and all the new growth after.

Just like the other plants, this growth had stunted several times, stopped growing roots, roots dying then re-emerging. Very strange.

But the root growth is very strong on this one now.
 

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This is Auto Jack

She had it the worst. Her leaves had become bright yellow, several times she began growing, then quickly died out, lost her roots, wilted over then picked back up as a seedling. She went through that cycle 3 times. I was ready to toss her and Amnesia.

Remember, all these plants are over 4 weeks old.
 

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Okay, I banged up the nutrients to roughly 800-900 ppm.

Then I added some cal-mag.

All the plants look MUCH BETTER!

I think it had major deficiencies, phosphorous and calcium and Magnesium and nitrogen.

Realizing my tap water was only 40+ ppm I desperately needed to add the cal mag.

My plants are growing so much more vigorously now.

I'll post pics when I get home tonight.

Thanks a lot everyone for the great and helpful input!
Glad to see you're back on track. I had the same problem and cal mag helped me.
 
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