After doing some Googling I think these are sympto...

it could be also and syndrrom caused by overwatering

use a free app to calculate how much Ca you are provding .. if it is greater than 100 elemetnal ppm and Mg around 75, you are probably fine and that points more to the light being a problem. (* not ug/l .. elemental ppm is different) Great thing about soilless growing is that you provide 100% of the nutrients. No guessing as to how much the substrate is adding. even a 'light' mix is essentially inert within a week or 2. should be providing 100% of the diet every fertigation with 10% runoff. this is how you use coco or similar.

i'd google again. Calcium deficiency does not cause chlorosis, so those sources are just plain wrong and an excellent example to take word-of-mouth forum posts and these grow questions with a grain of salt. download any leaf symptom chart for a visual aid and you'll see i'm not wrong. always verify what you are told, because faith will lead you to major problems and inconsistency. you may have 2 things going on, but due to location of the chlorosis i'd say this might be from applying a bit too much light. Even if it tooks a couple weeks to present itself. There's no reason to give more hours of light unless you havea weak grow light and need to make up for it. Providng more DLI than a plant can handle will only lead to damaging the plant and no boost to outcomes. More is not better. The 'right' amount is what you shoot for. it is dictated by temp, rh and atmospheric co2. So, your mileage will vary compared to other gardens. you must always use the plant as the guide, and not some top-down preconceived notions. Suggestions are a good starting point, only. Always need some fine-tuning for your local variables.

reading over your nutes and soil being used everything should be fine but it's not. The soil being used does require adding nutrients hence its Light-Mix name. From your diary, everything is in acceptable ranges, possibly a little cold at night though. No offense MrCoffee but calcium uptake is between 6-7.5 ph. By having to add nutrients so early because of the soil may have also caused toxicity. If it was me, I would flush and add 1/4 nutrients with last gallon. Double check light strength (if LED) and height. I have yet to feed any of my grows with 100% of what the bottle/chart says to do.. Good luck

I'd lower your input PH to 6.0, doesn't look like just a calcium problem, possible watering issues. Water slow, so all your grow medium soaks up the water so there's no dry spots inside. Wait until pot is light before next watering.

Hi there, to me it looks like calcium and nitrogen deficiency. Calcium is best absorbed above 6.2 ph. Hope this helps, happy growing!

Hi, looks more like Nitrogen if in fact it's nutrient related. The entire plant is light green. Calcium starts in young leaves. It's normal to go straight to nutrients and its confusing trying to diagnose. First you need to make sure of the basics first. Not over or under watering, light setting an height, PH, water temp, what water source etc.. My 100 watt LED has to be set to 50% power and 20-24 inches above plant. Heat stress and light stress will cause what's going on also. I use Fox Farm and Roots organic soils and don't have to feed until 3rd week of veg. and then only 1/4 strength every other water. I also use 5 gallon pots and only need to water every 7-8 days during veg.