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I don't see you list K anywhere.

I have induced this kind of "stunting" due to severe iron/trace deficiency, particularly in rotalas, apart from color change.
 

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Simpte 27 said:
Is it possible to have a Ca defficiency with a gh of 6-8?
Yes, I had GH=8, but still Ca deficiency, it is relative to other elements, like Mg. It got better after I added CaCl2 to bring GH to 13.
 

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NE said:
Do you have any records of what amount of Ca and Mg you had before the change and what you have after your change?
Unfortunately, my Ca kit is useless, I only measure GH. I simply add Ca and observe plants.
 
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