[shalu]

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.

 

[shalu]

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.

 

[shalu]

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.