something wrong with Ca

Think that is root-zone issue -- are you watering too often? It says 20% vermiculite, but i don't see any at all, so aeration is a concern too. Should be closer to 2:1 coco:vermiculite, too but that alone wouldn't do this, but would exacerbate bad irrigation habits. Your nute ratio is fine. Time will tell if 1.6EC is doable or not, but again, this looks like an overwatered plant.. even if it took a while to display some symptoms. Mg deficiency takes 30+ days to see a problem after it starts inside the plant, these look like they are too young to show such a symptom. Calcium might be a tad high, if anything, but like i'm feeling pretty confident this is irrigation-habit-related. Are you getting a 10% runoff waste water each irrigation? feeding every time? if you waren't getting 10% runoff, that could be exacerbating the ongoing issue, too. the runoff is how a steady equilibrium is maintains and avoids mineral buildup over time. your pH is fine. FWIW, you may need a bit more magnesium and Sulfr, but at this point you could not see a mg-issue even if one was present.

Foliar application of water soluble nutrient. Plant can absorb nutrition through leaf, this allows temporary relief of deficiency through leaf until the rootzones problem is rectified. Need your ph first. 80% of issues are environmental not nutrient related.

Certainly looks like calcium and magnesium deficiency. The question is what's causing the issue. Nitrogen is the most sensitive of all the nutrients to toxicity. It may not be deficient but unable to "uptake" through roots. Ph must be checked to be within range first n foremost. Nitrogen. When in the form of ammoniun, nitrogen interacts negatively with the plant's uptake of calcium, magnesium and potassium. As a result, excess (nitrogen)NH4+ can lead to a deficiency in any of these three elements.