It all looks like a Calcium Deficiency

[BallsackSal]

Both this grow and my last grow have been plagued by what appears to be a calcium deficiency. It is not. My GH micro comes with 5% Ca. And I have tried no CaliMagic, a little , a lot. It doesn't matter.
But what I did notice is that there is no Magnesium in my nutes. Could this be the reason for these issues?

 

[Arthur]

Pics would help, and more info on both grows as well. Running soil? Coco? Etc?

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