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Sorry, I misread your post; I thought you were suggesting two of them were in one pot. My bad.

With no other info, you look short on Ca which is supported by the fact that the spots are on your upper leaves. Good luck.

In my opinion, neither case here is a P or K toxicity. The chattered, yellow leaf margins, in both examples suggest you're short on K, which wouldn't be a surprise being you're in flower. As noted the leaves won't repair themselves, but you can subside any further affects. I'd make sure your...

pH.... you'll need to learn to manage this if you're going to grow successfully. Once you do, your plant will thank you. Good luck.

Your plants look short on Mg. I would be sure you're at the proper pH for your style of grow and once you've confirmed that; I'd start adding Epsom to your feed / water. In the future I'd avoid planting two plants into one pot...one plant will dominate, leaving the other less than it could...

Generally speaking, when a plant this small is showing a 'deficiency' it's generally on account of pH. A plant this small isn't pulling huge amounts of anything from the soil, especially not micro nutrients. Dial in your pH and you'll most likely see the improvements you want. Good luck.

A few tips: As pointed out; it's better to run all soil or all coco, but combining them seems to cause a lot of people issues because of their marked differences in how they work. In the future, choose one or the other; it'll make your life easier. You need to get rid of the clear pot....your...

What are you doing for Ca?

pH...you'll need to manage it, and right now, 6.6 is way too high for your style of grow.

Generally speaking, pH would most likely be the cause of the twisted / contorted leaves. The red petioles suggest an Mg shortage, and by looking at them I would agree. Epsom salt is your friend, it should green them up all the way around. Good luck.

What @spek9 said...Jack's 321

6 is too low for Ca uptake if you're in soil....6.5 or just a hair over is where you need to be to optimize your Ca uptake.

The chattered leaf margins generally suggest a K issue, but I'm just one man with an opinion. I do agree with what you're saying in terms of the Ca, and while he looks short on it to a point, I think he / she has bigger issues.

Looks like a Ca issue and if you're in soil, your pH is too low for Ca uptake. Good luck.

No, not fade...it's a K deficiency, BUT...you're too far along to worry about it, so don't. You'll have a nice harvest; not to worry. Take notes on what you've fed and so forth, for your next go round. Good luck.

I'm not a soil grower, so I'm hesitant to make a suggestion for you in terms of a suitable nutrient line; sorry. I'm sure some of the soil guys and gals on this forum can help you with what works best for them.

Your plant looks awfully green for being in flower...perhaps your N is locking up your Ca. Either way, as mentioned, it's showing short on Ca. Be careful how you attempt to rectify the problem as typically Ca is paired with N and you don't need more of that (N),...Good luck.

Here are a few pointers: Feed (not plain water) your plant daily. Allowing a coco grown plant to dry out is no bueno. Do not up size the pot...3 gallons in coco will grow a monster and allow you to feed, feed, feed...which is the benefit of this medium. You needn't change pot type either...

No, it's not nutrient burn...and I don't even think it's a deficiency. If it were across the plant, if you had more than one or two leaves to use as an example, I'd be concerned but if those were all I had, I would tread lightly in terms of trying to make the plant perfect and work off the law...

My two cents: I would adjust your pH closer to 6.5 (you're missing good uptake otherwise). Your plant looks short on Mg; Epsom salt is your friend...and a dose of it each time you feed won't hurt. Get away from the 19-4-23....you're in flower and this is not what you want. Find something...