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Is this normal?

A lot depends on the NPK ratios of course. Ginge is giving very very low dose calmag in flower. There are very few liquid calmags on the market that don't contain N and then lucking they are compatible with your base nutes & other supps you are using regarding stabiity and integrity of the nutrients is a long shot if you mix brands. I tried a few approaches and ended up sticking with a calmag with N and just managing it accordingly. It's not the approach I wanted because I was really struggling with leaf issues 4 weeks or so into flower with my sativas showing cal & then mag deficiencies, leaves losing pigment big time and covered in the rust spots all over and drying out.
 
Update: problem still seems to be getting worse, but maybe I’ve cracked it. It definitely looks like the calcium deficiency symptoms over on the website (thanks Bluey), so I’ve been feeding with a ph about 6.3-6.4, but I didn’t check the runoff until today. It was 5.9, which is apparently too low for calcium uptake. I flushed it tonight with ph 6.35 and got the runoff up to 6.2. I’ll give an extra heavy feed tomorrow and make sure the coco ph stays up. I also turned the light down a little.
The confusing thing is that the runoff from the healthy plant was 6.15 (compared to 5.9 from the unhealthy plant). Everything is identical with the two plants as far a growing medium and feed, but they are different strains. What are the roots in the unhealthy plant doing that causes the ph to drop that the roots in the healthy plant aren’t doing? And I feed both from the same batch in the same sprayer, so I know I couldn’t have made a mistake with one and not the other.
 
Thanks! I felt I was getting very lucky, but that the bottom could drop any minute and spoil three months of work. I guess that drama is just the toll for growing my own weed. Hopefully after I get a few grows under my belt, it won’t be quite so nerve wracking.
 
There is an exchange of ions at the roots which fundamentally changes the pH of the runoff. I don't measure runoff pH because it's not a reliable indicator of pH issues. I tried that on perfectly healthy plants in coco a few times and was getting really low readings indicating I had a low pH problem, but I didn't. Plants were fine.
 
I’d never checked the runoff either, but I hope in this case the low ph runoff does point to a problem. The issue is getting worse and if it’s not calcium deficiency caused by low root ph, I have no idea what it could be.
 
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