The pics actually don't look bad at all. That one pic where the yellow leaf is visible might be lack of light since it only seems to be that one leaf. Otherwise, that leaf is showing nitrogen missing. Nute lockout isn't only caused by ph issues, it can also get locked out if you put in too much of another element causing a seperate one to be locked out. Like putting too much calcium will lock out magnesium, among other things. In cases like that, it's best to flush to get rid of an excess of one element disturbing others. The little purple tips can happen and from my experience, i get them as well but only at this time of year, it's when temps drop below 70.
Just saw the 'led' pics, it's easier to see there. Ya, that yellowing looks to be nitrogen missing, and in 2 other pics, it appears to be magnesium getting low as well. This is when the plant is using the most magnesium, once you hit mid flowering. Magnesium works in conjunction with phosphorus, so as magnesium gets low, the plant also will not be able to uptake phosphorus, even if it's there. Add 1 teaspoon of epsom salt to a gallon of water next watering. Keep watching and don't add too much, but magnesium, especially at this stage, is critical!
Just saw the 'led' pics, it's easier to see there. Ya, that yellowing looks to be nitrogen missing, and in 2 other pics, it appears to be magnesium getting low as well. This is when the plant is using the most magnesium, once you hit mid flowering. Magnesium works in conjunction with phosphorus, so as magnesium gets low, the plant also will not be able to uptake phosphorus, even if it's there. Add 1 teaspoon of epsom salt to a gallon of water next watering. Keep watching and don't add too much, but magnesium, especially at this stage, is critical!
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