Looks like they need water urgently in the last few pics.
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Roots look goodđ but the soil looks very dry, your soil should always be moist but not wet before re watering, when they dry out like that they will try and suck up every last bit of moisture, which usually contains a lot of nutes, which in turn will cause burn.
Water them slowly, donât drown them or you will have the same problem. When people say they like wet dry cycles itâs not exactly correct, they need wet, moist cycles.
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Yes it is important. Newer growth always tells the truth.
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Yes it is and why you need to show pics of the whole plant to see whats going on properly. New growth looks good, and you have a thick canopy, so I would now say, they are probably letting those bottom leaves die off from lack of light, and taking the nutrients from those leaves to the top leaves, that are photosynthesizing.
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I watered it with very little clean water and the bottom improved, the plants are happier. it was my mistake to dry them. I am an amateur is my first box. what should I do next, give them nuts? should I create a new topic, I donât know the reality of the forum.is it potassium deficiency in the first and second photos?
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Those plants donât look deficient . Iâd give them a good and thorough watering.Then I would leave them alone for several days .Then when your pots feel light and the medium seems dry I would water them again thoroughly. Give the plants time to recover and then see what you have. My guess is there is no problem here except learning curve. In my opinion your list of nutrients is ⌠well, too much. Pick one simple veg nutrient and just use that alone,sparingly. I feel like your trying to do get them âeverythingâ. They donât need it they need very little. Its a weed it will grow out of the crack in a sidewalk with no help from anyone trust me. Hope this helps
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Like bostonbud said, give them plain water and LITFA for a week then see how they are doing.
There is an optimum level for nutrition, more than that optimum screws everything up.
They may just be transitioning from their stretch to full on flowering, depending on how long they are from flipping. When this happens they switch from a mostly N uptake to mostly P uptake, and the soils ph will change as the bacteria switches over to predominantly fungal.
As your using bottled micro nutrients though your bacteria are not needed so much in breaking the plants food down, but there can be a delay in the P availability which will correct itself without help from you and a little bit of patience.
Most new growers always do too much in their first year growing, I killed all mine half way through flowering on my first indoor run 
Be patient, rushing to correct problems that can correct themselves with a little time just makes things worse, and you end up chasing your tail.
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my friend, sorry but I donât quite understand the comment, the first two paragraphs are incomprehensible to me. what is âlitfaâ? I watered them with only water, they immediately came to life. What are the next steps? give them nuts? I have at my disposal:
- canna
-canna flores
-canna vega
-canna pk 13/14
-canna boost - bio bizz
-bio grow
-bio heaven
-bio bloom
-top max
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OK LITFA means⌠Leave It The Fuck Alone 
So just keep watering them and do nothing else dont add anything to the water for a week.
This means for example, if 1 gram of food is good for them, 3 grams is not necessarily 3 times better, if they can only handle 1 gram.
You can get a jug of LITFA from ReikoX industries, extra strong for new growers or regular for more experienced growers, I put this shit on everything
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Hurry now while supplies last! I have a side hustle with @ReikoX where he cut me in on partial earnings of this awesome product!
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To MarijuanaKills,
Hi, I caught this thread and I hope you and your plants are doing better. I want to point out the point about your plants leaf discoloration and your belief it is a potassium deficiency.
It cannot be in my simple opinion. Why? Because you are feeding with so many nutrients that contain K (potassium).
Like the others say: Choose one line of nutrient, stick with it and go easy. I do not grow inside, but humidity in the 30% range is way to low I believe.
BestâŚ
Hastings
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