Can you diagnose the condition of the leaves from their color and state?

Pas de PK pendant la croissance et encore moins pour des si jeunes plantes!!!!!!! Bonne chance et bon jardinage à toi

Happened to me first time round mate, potted them up to early. They’re overwatered and over potted, a sufficient enough root system wasn’t established before potting up. I know people who can do it this way but personally, I would either put it to the side start some new ones. Best advice don’t give them too much love they don’t like company.

one other thing.. you give that 1.3-1.5EC mix with every irrigation.. always fertilize in soilless grows, that's the whole benefit of them. Religiously get 10-15% runoff and throw it out -- down drain or outside is fine. Do not use on other potted plants. Plants in the earth it will be a bonus, but plants in a pot it is potential risk even if it doesn't cause a problem every time, it will eventually. The runoff ensures you never buildup solutes. The concentration will remain at that 1.3-1.5 after any irrigation.. evaporation does increase it between irrigations, but that's built into recommendation of 1.3-1.5EC concentration. you want at least some minimal amount of dryback/uptake before you add more water. Safest is to let it get fairly dry (feel weight for consistency) and then irrigate. More advanced methods involve frequent irrigations per day, but that takes the right amount of drainage in your pots to avoid major catastrophe.. keeping a substrate wet all the time carries with it increased risk of problems. Get a few grows under your belt before trying and obviously needs to be automated because who can water 2-3x a day?

it's in coco and the only thing i see fed is .38mL/gal of 0-13-14 pk boost? coco has no nutrients in it... it's probably starving.. i don't know what kind of ppm's that "pk boost" is adding, but i don't think it's high so lockout is unlikely. you need a more well-balanced feed. something around 1.3-1.5EC (ppm meters calculate from EC but depending on region it is calculated differently. EC is apples to apples) if in US or NA that's most likely 650-750ppm. npk will be a large portion, but ca mg and s are equally important. @ 6.0 pH 120-140 N 40-60 P 180-210 K your water will impact some of the secondary stuff. Ca - 100+ -- more if you use RO or you don't have hard water like me. Some need upwards of 130ppm. Mg - 80+ S - 100+ You are doing a soilless grow. Embrace it. Know what you add. Track it. You will learn faster and eventually not need to keep such tight tabs on things... once you are familiar with your mix of nutes and have some consistent seed to harvest success keeping plant healthy. it'll alwys be close but not exactly the same.. but at that point adjustments will be very obvious as to what you should do. manic botanix has an online ppm calculator or make one yourself with a spreadsheet.

Hello! Then basically they all have NPK deficiency, nitrogen deficiency can be recognized by the color tending to yellow, P deficiency can be recognized by the red stems, which together with K deficiency cause burning on the leaves :) you can still fix it, but they will actually go to produce much less than healthy seedlings. Since you are growing in coco, keep in mind that it is a substrate with virtually no fertilizer, so you have to fertigate every time! Check the pH, it absolutely must be below 7 and above 5.5, 6.3 is fine. Be careful then that the smallest one is suffocating on the roots (the leaves are bent down), so I suggest you spray the leaves with fertilizer and when the soil is to be watered, be generous with npk!, If within 10 days they haven't recovered, re-seed, and try to have 300ppm for the first week, 500-700 for the second, so you can avoid the same problem :)

pk booster only in flower ........ my first guess seeing something like this - too low ph, do you measure it ??? but seeing that you in coco, maybe its hunger ??? you know how to grow in coco , if no, better start again, those autos are wasted anyway and find a guy, who will help you and grows in coco Creepy going for win this month, he grows, wait for his, or other growers answer and follow, text them in chat, ask for guidelines ... Good luck !