DWC bucket grow

Hello my friend, this is clearly a root problem. Check if the roots are healthy, and like the others said check the grow system if it does provide enough oxygen. It can be caused by both but it is definitely a root issue not a deficiency.

Kinda looks like it might be a PH issues to me on the leaves. Maybe from root rot like suggested below. or lack of oxygen. If your piggy backing the buckets this might be the cause if every bucket does not have its own air stone or form of aeration in it. Good Luck!

Even though it's the same plant, it's a different Pheno. That being said, she might require a bit different feeding. I would lower your ppm for this lady because she's a little toasty is what it looks like to me. She just doesn't like as much feed as the other is all.

I'm with AutoflowersSuck: could be root rot. But make sure it's not the airstone that's clogged up first. ^^ Polyphemus: not KISS, as usual… And if you'd turned on your eyes before mansplaining, you'd have realised that nutrients aren't the problem here, as both plants have the same sauce.

Some formulas are better than others, even if they work well seed to harvest with "a" plant, it may not be the same with others. A 1-1-2 NPK ratio and 4-2-1 K:Ca:Mg is what research says works best -- at ~6.0 pH, give or take a couple tenths. Compare what you are mixing up and consider trying this.. These are ballpark numbers. My weighted average %of mass ratios for these things is 8.1% N / 8.9% P / 14.2% K / 7.2% Ca / 3.9% Mg -- you can see these are not exactly those ratios but are close. I almost never see a plant with tox or deficiency symptoms no matter how many strains I am growing off the same reservoir and across 5 years of use, so far. Some small thngs can happen, but the progress slow and easy to correct. these minor corrections for 1 plant have not caused an issue with others, so far. PPMs 120s 60 180+ 100+ 50-80 this would be a light 1.2-1.3 concentration with 100ppm give or take of S. The ratios shouldn't need much adjustment, but overall concentration may. e.g. if you use co2 and tightly control environment etc etc.. can' probably feed higher concentration than a less environmentally-controlled grow. More light will increase metabolism to a point, too, which would result in a greater need for building blocks per day to match growth rate. A plant with esoteric nutrient needs is a reflection of a shitty breeder, imo, relative to a formula that works for 95% of plants i've ever grown. 1/20... that's just poor selection of plants with shit-ass traits in regard to feeding... probably for some superficial trait that has nothing to do with bud quality, LOL like what color the leaves change in senescence or what looks prettier for a picture on the internet in lieu of traits of more importance, like unusual sensitivities to one or more ingredients in ferts. Not saying that is what you have.. if your formula is drastically different, i'd wager it has more to do with the formula of that nutrient system. While the ingredients are commodities of no differing qualities, some follow existing knowledge base and some think they are better than generational knowledge just because 'this' formula worked for some grower that is not popular.. read about hte se various "inert name"'s formula... all they had to do was look up existing knowledge and save a whole lot of effort.

Check the roots. Sounds like you got a rot issue goin on.