Yellow tips, some curled down, F6

Hey I am growing in 7 gallon fabric pots for two plants & one in a 5 gallon plastic with tons of holes drilled all over the sides & bottom in a living soil (detroit nutrient company).

One of my plants seemed too light green in new growth so I tried using a foliar spray with micronutrients. I was not PHing the water about a month ago but thought this could have caused the issue in this one of three plants and I used some on it and it did seem to improve. I then sprayed it again but thought why not spray the other two plants that were fine. I am unsure if this caused the issue or not. I also bought Dr. Earth all purpose organic fertilizer and used a bit less than the recommended dose and top dressed the soil and then watered it in last friday (7/17). I also did a foliar spray on all three at the same time I was watering.

I have noticed that all three plants now have tiny yellow tips at the ends of many of the upper leaves mainly & new growth mainly. I have not given any additional nutrients or sprays since 7/17.

The temps are 73 - 75 daytime & 65 - 67 at night time with RH around 50 - 60. I have a 315w CMH & a 225w HLG LED around 18 - 20" above the plants. I have uploaded some images from each of the plants. I wanted to see if anyone had any input as to whether this is a minor issue or not. The plants all appear happy and are praying as normal and are growing fast still since they are stretching right now, I switched to 12/12 on 7/17 (F6 Today).

I have attached several images of various parts of the plant.

Pic #1 is a clone of Pic #6. Pic #6 is the one that seemed too light green which is why I began with the foliar spray and also added nutrients thinking maybe it was lacking since the plant is quite large. The two oldest plants vegged for around 3 months, the clone of this one vegged for about a month. They are Mazar strain.
I thought that maybe the two plants have become too large for the 7 gallon pot and were not getting enough nutrients from the super soil which is why I started using the nutrients in the first place. Maybe this was not the issue though.

I have added some additional images showing the full plants and one of the plant that is very light from July 2nd right before it started going light.

The darkest green on the one on the left, which is a clone of the very light one appears to be doing very well. This is the color that the light one was, before new growth started coming in much lighter rapidly about 3 or 4 weeks ago. The other plant in the picture with all 3 in the back is one of the two seeds, this one always grew a bit slower than the one that turned light. I have noticed this one seems to have also gotten a bit lighter as well.

You can see on the light one the section in the middle which is where it began and those leaves are very yellowed looking, but as it grew and I added the foliar spray a few time and started changing my water ph from 7.3 to 6.3 - 6.6 it began improving. It was really drooping when it started getting really light growth but now is perky and looks fairly good

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 have been. Good luck.

CannaCountry said:

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 have been. Good luck.

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Yeah I thought it could be low on magnesium as well from looking into it. I will get some epsom salt and try a low dose when I water next. I don't actually have two in one pot though, they are just really big and bushy, I topped & lst the two biggest ones, and just topped the other one. They have been vegging since the beginning of May, around 75 days or so.

I think vegging for so long may have caused the problem. I wonder if they have become too large for the pot and can't get enough nutrients out of the soil fast enough anymore or something.

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