They look to need cal mag and possibly potassium. The brown spots indicate calcium deficiency and the yellowing between the veins is magnesium. Brown edges says potassium deficiency. I would check my meter calibration and do another slurry to verify ph. If it’s still 6.8, I would give them call mag at 200 ppm and ph at 6.0 or 6.2 to help it back into range. Don’t go too drastic as ph fluctuating will cause them problems.
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I just started to do exactly that. Plus hydroguard because I already have it left over , cant hurt.
Cant use all my hydroponic nutes.
I fed in RO water at 6.2ph
This particular plant hasn’t rebounded like the others.
Leaves are crawling
So maybe go 6.5?
I have well water, but it has some minute amounts of ecoli. I still drink it, it tastes great
Its high up there at 7 to 8 range pH
Can I adjust pH and feed it?
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Depends on slurry results. If it’s 6.2-6.6 I would give it a light dose of cal mag every water, it will help the water take a ph easier. RO and rainwater both contain no bicarbonate to stabilize ph, so they will simply take on the ph of your medium. Water must contain bicarbonates or acid to affect medium ph. Either can build up in medium over time and influence ph. If your slurry is in range, you could just use RO or rain and not worry about it. I would just use a light dose of cal mag (75-100 ppm) every water so you can ph properly. They need a lot more going into flower which is probably why your deficiency showed up. Soil usually runs low on nutrients by flowering, you may have to feed them til finish.
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You can ph well water and feed with it. Make sure to check the TDS of your well to see how hard it is. If it’s 250 ppm or less, it’s fine. If it’s under 75, I would add cal mag to get it 150ppm.
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Ok got a pH sample from run off from feeding last night
7-7.2 is what I got. Water was somewhat dirty.
Do you have a TDS or PPM meter? Ph is too high, you may be locking out nutes rather than being deficient in them. At the wrong ph, plants can’t uptake nutrients even if the roots are swimming in them…
I have a good blue labs pen…
What do you suggest?
Check runoff EC if it has that function, plus ph.
It’s just a pH pen…
OK, EC would tell me how much nutrients are still in your medium, ph will tell if it’s locked out.
Is the bottom right the problem child?
Yes, orange sherbet came out a little different…
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You might wanna pick up an EC pen. Amazon has one that does EC, PPM, TDS and salts for about $30. It’ll tell you a lot about your medium and nutrient content.
I have one of those cheap ones but the pH bulb took a dive… I was getting false readings with these plants for a while and didn’t know.
Can I trust the readings on EC PPM?
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Oh hey so this run off was collected from a drenched towel that soaked up the run off. I ringed it out. That should be ok I hope?
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I wouldn’t trust that one. You should catch runoff in a container , not rung out of a towel! No telling what ph that towel was from detergent and softeners etc.
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alrighty
I will collect a slurry sample and get back with you.
Thanks for the guidance 
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Anytime! Good luck.
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Sorry, gromie…because you’re feeding your plants with commercial stuff, I’m not much help. I’ve never owned anything to measure the PH of the tap water going in besides drops/color; nor anything to measure ec/ppm. There are a lot of good bottle-feeding growers, I just didn’t teach myself that way because I needed it to be simpler and more organic. Your plants are looking full 
, you must have decent control of your environment at least which is 90% of the battle, depending on your goals and needs.