Nice,these new LEDs sure seem to suck out the calmag from the top leaves.I normally spray epsom twice a week seems to help.
I had an EC spike in the rootzone which caused a slight pH issue I believe possibly causing uptake of Ca issue.
EC was going in at 0.8 and coming out at 1.4 so I knew something was going on.
it hasn’t really progressed since I stopped it only the existing leaves that had the issue are still there.
i put it down to a little too much MKP at the wrong time Along with possibly the brick coco I used and didn’t bother to buffer.
I was using between 0.2-0.4 EC of Calmag pretty much the whole way through but stopped until I rectified the issue which stopped progressing after I stopped Calmag.
next grow i won’t be adding Calmag and see how they fair just from the Ca and Mg in the base A/B.