Leaves curl

Looks like overwatering—- it too much then too little water—- irregular dry back

Yeah, lockout is probable. As you say - nutrients are nutrients, without/with pH perfect, but it works fine for me. Maybe I don't have a pH tester, but I made every time a test in a test tube with the addition of a drop of pH liquid, and the result is really good - I mean, pH is good. Second think that I can't do (I dont have the equipement) to check the condition of soil in this cheese sollution. It can be overfertilized. It can be some deficiences. It can be by old leaves (the plant is so faster then the others in tent - they germinated in the same time). So what can I do without equipement. Is better to hold it to the and, still adding nutrients (right now will be time for PK booster like Overdrive), or should I try to help her a lot? Maybe flush, maybe deficiences, gosh, first time situation like this in my grow history and I'm like child in the fog, so lost.

Old leaves just do this, it is a normal process during flowering.

Assuming this is from your current diary that’s flowering, I’m saying lockout is probable.. in the pics in the diary i see a few distinct different deficiencies.. and you’re feeding a plethora of AN base nutes and supplements.. And that could be salt build up lockout or pH being off lockout.. the pH perfect line is far from being an excuse to run without pH readings every feed. It’s a marketing gimmick frankly.. As nobodysbuds said, more info on medium etc is necessary for in-depth response, but I’d check EC and pH of runoff just to rule out some things.. my guess is EC or pH or both are out of whack if you test runoff. Hope ya get it figured out

need more info... great thing about soilles and hydro grows is that you can know the ppm's of everything you give the plant. easy to deduce what is wrong and adjust. When it is difficult to tell by symptoms, i lean toward lockout. On top of that i think AN instructs a pretty high total ppm or there is something off with their N:K ratio, if not mistaken? i see a lot of burnt canopies from them... i've seen ppl grow perfectly fine plants too, don't get me wrong. A rose is a rose... magnesium sulfate is always magnesium sulfate, etc... hydro/soilless fertilizers for the most part are neither low quality nor high quality relative to how they are made, as they are the same ingredients with a few options. the individual components of fertilizers just need to be used in right ratios and at a safe pH range. The ratios will be consistent, but concentration depends on other environmental factors. e.g. if you have a low vpd and can't do anything about it, it's worthwhile trying a slightly* higher concentration to offset the slower uptake in roots.

PH was good. I'm using Advanced Nutrients, they got pH perfect, but i checked this by pH test. Water, hmmm, I'm always using the same water, my other plants don't have this problem and never had. This is the first time when I see yellow, curled leaves

A PH just a bit too low could explain a lockout for calcium, magnesium and P, and why the plants doesn’t respond anymore to any nutes you gave. I saw it’s not your 1st diary, what was your PH range during your last grow ? Same, less, more ? Is your PH tester still well calibrate ? If you think it might be a PH issue, maybe you shouldn’t feed more, but flush with a water at 6.2 minimum, then stick to the feeding schedule you were following so far. I wish it may help you. Good Luck 🤞