A deficiency, a toxicity and a toxic-deficiency???

potassium deficiency. https://loudclouds.co/wp-content/uploads/2016/07/marijuana-deficiency-chart-jorge-cervantes.jpg that is an image only link as i'm not familiar with that website. it was found through a duckduckgo image search. There's a higher resolution version out there but it was not near the top of the search - it allows you to zoom in better and probably worth it to look for it and download it for your own reference. If you look at these symptom charts each time, even if asking for help, over time you'll learn it on your own. Still good to ask sometimes, as symptoms are not discrete as to what is the cause. did i think it was a k-deficiency in the last question and said wait for it to progress? I am even more confident in that guesstimate, now. Slow progression = small adjustment needed to fix it. Don't go crazy. Maybe add 10% to your weighted-average K% value of your mixed nutes. if you calculate ppm, probably +20ppm give or take, but that depends on how much you give... in soilless/hydro should be up around 180ppm,, but soil is different due to what was pre-amended into soil + what you provide.

Hmmm, thats advanced Excess of potassium: leaf necrosis (the brown dots) especially on the edges, burned tips, rusty looking Also i can see some deficiencies like Magnesium(purple stems) and Zinc(at least in your diary when you show your newer growth) Soo, you either put in some hefty amounts of Potassium fertilizer (you maybe homebrew some tea or gave some gardening hacks and tricks?) then thats the Problem or very very bad pH (do you check the pH run off?) I bet you know can come to a conclusion, if you think about what happened, when it started, and you now either have to just plain water for some time, or correct the root zone pH. Good luck !

Hello mate, I think you have a bad excess of Potassium, if you feed the plants everytime with feeding product it's easy to sse an excess, if this isn't the case so you might have an issue with the ratio of Ca/Mg in your tap water, when you use organic nutrients you must ever have a Ca/Mg ratio of 4:1 or 3:1 and from this start to feed with the right frequency. Good luck and happy journey with your plants! if you need more, feel free to contact me