I just can't seem to diagnose sick plants. Pics inside

I'm on about day 15 of flowering and I have 4 plants going in my tent. One plant has been pretty sick for the past 2 weeks or so and I've been trying everything to fix it. It seems to have gotten a little better, but the same issue is spreading to the plant next to it in the tent. I have been consistently removing the sick leaves also.

I'm using Fox Farms ocean forest soil, been giving them GH flora nova bloom nutrients every other feeding, lately started giving them cal-mag and botanicare hydroguard root inoculant, all of course adjusted to the proper PH level (5.8-7). I recently started adjusting PPM of my solutions too and haven't been giving them over 800 PPM. What the heck could this be? Is it a disease, deficiency, toxcicity, or something else?

Do you see any bugs around? Looks kind of like a fungus gnat issue. Get some dunks and get something to cover the tops of your soil. A mulch or something.
If there's no bugs, then I think you have a ph problem. Perhaps a bit of lime? I always had similer issues with that soil. But many on here grow with it very well.
Of course there is a question of how much have you been feeding them? That soil should go about a month or so with no nutes needed.

Wilderb said:

Do you see any bugs around? Looks kind of like a fungus gnat issue. Get some dunks and get something to cover the tops of your soil. A mulch or something.
If there's no bugs, then I think you have a ph problem. Perhaps a bit of lime? I always had similer issues with that soil. But many on here grow with it very well.
Of course there is a question of how much have you been feeding them? That soil should go about a month or so with no nutes needed.

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Thanks for the reply. And yes I have seen gnats around the tent before, but this discoloration looks like some sort of deficiency though doesn't it? The PH has been good the whole grow by the way.

fuzzydunlop1 said:

Thanks for the reply. And yes I have seen gnats around the tent before, but this discoloration looks like some sort of deficiency though doesn't it? The PH has been good the whole grow by the way.

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PH in organic soil should not be an issue unless you've been adding lots of extra nutes.
I think backing off nutes a bit and dealing with the gnats. I'm sure someone will tell you to add calmag. I did that also and never fixed the issue.
I dealt with the exact same thing but I was using Fox Farm nutes also.
You can't force a plant to take up extra nutes. They will just lock out something else.
Deal with your gnats or you're going to have buggy pot
WE

Wilderb said:

PH in organic soil should not be an issue unless you've been adding lots of extra nutes.
I think backing off nutes a bit and dealing with the gnats. I'm sure someone will tell you to add calmag. I did that also and never fixed the issue.
I dealt with the exact same thing but I was using Fox Farm nutes also.
You can't force a plant to take up extra nutes. They will just lock out something else.
Deal with your gnats or you're going to have buggy pot
WE

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After doing a quick search for fungus gnats I found that they are known to cause issues that are sometimes misidentified as deficiencies. You may have solved my two week long battle trying to identify! I'm going to try a few things to combat the gnats and see if these issues clear up. Thanks!

Can i see the plant those leaves were attached to?

Calcium. I would get some gypsum on your soil and let it leach in. The calcium is a slow mover and will take time for the plant to take it in ( a week). I have little doubt that is anything but calcium though. I bet your soil is too acidic however but low in calcium to begin.