photoperiod question - seedling

i always do straight to final pots and even boost already preloaded soils like Biobizz allmix or promixHP. never had issues, just start feeding at week 4 or 5 , depends on plant size. i grow only in soil, in coco it would never be a question even.

If your soil is fertilized is will be too hot for seedlings.

Seedlings stay wet too long in big pots.I know from experience they're better off when they have drier periods,its promotes root growth.Check out the clip and pictures of my roots during transplanting and you'll see what I'm talking about.

Shouldn't do that with autos, either. Unless you purposely mash up the roots while potting up, really shouldn't experience shock. I've done 300+ 'transplants' (potting up) and yet to see one get shocked in 6 years. Large pot tiny plany = shitty watering habits or a pita to do it sorta well. Not only could it be your chocies of fertilization/soil, now it can also be watering habits causing the problem. so, are you watring all the way to the bottom of the plant or just superficially getting it wet near top? waiting for apprpriate dry back and then repeating? If, not you need to fix watering process. Water a small column around the plant just larger than the canopy, but make sure it gets wet all the way down. dry pockes and zones where it ebbs and flows with moisture are high-risk for buildup of solutes. Causing toxic zones for the roots. It's just too difficult towater properly with a big pot / tiny plant. You also gain several benefits from allowing a root ball to develop as you pot up. id fix any potential watering habits before reacting to strongly to symptoms... if the plant is nosediving quickly, that may change your approach. Nothing you can do about it now, just water as best you can until it can properly drink it down in an appropriate amount of time. transplant doesn't cause deficiency/toxicity, at least not directly. Doesn't avoid it either. It causes bad habits that raise the risk/probability that it occurs, though. And, there is zero benefit to putting a small plant in a big pot anyway. No reason to do it, even for autoflowers. hot soil can definitely burn a young plant. this is not news. you'll have to eliminate possibities.

maybe? need pics. and diary.

Looking at photo#2 of the Grease Monkey diary, I'm willing to bet your light is too close unless you have it turned down a lot. That's pretty close for the size light you got. You might get a little faster start in smaller pots, but it's really nothing to trip on either. Your roots are gonna grow, then the plant will follow. Regardless of what other posters might suggest, you certainly CAN have too "hot" of soil(which means it's got too much fertilizer for the ignorant) for a seedling. If your not, you should be starting in a light mix. In a bigger pot it's not uncommon to use hotter soils towards the bottom of the pot with lighter soils up top, at least when starting in a larger pot and you're trying to not add any feed right away.

wait, wait, wait. 1. You don't need to transplant photoperiods at all when growing 2. you need to post some pictures here if you need some help on your plant problem, high quality, focused pictures are the best 3. even tho it's kinda a meme right now, you can't water such a tiny little seedling with THAT amount of water bro, you just drown them. 4. No... its not because of the hot soil and i never heard that and it made me giggle a bit :D 5. people are transplanting so the plant won't get overwatered but insuring the soil won't dry out at some points and roots grow quicker and faster if they are in a tiny pot first, at least thats what promised. So you really only need to water the amount of water the plant can uptake with their TINY little roots for that moment, soil needs some wet-dry circle tho You still could transplant them in a smaller pot if you are careful enough. Will make everything easier but people grown weed in a pringles can, everything works somehow if you don't want to transplant. If you stay with the big pots and therefore need to water more so the soil won't dry out completly try adjusting the VPD. this means temperature, humidity and leaf temp. there are very good videos on youtube of that, if you want to improve. Mastering VPD gives you at least 1/4 better/more yield imo So thats my opinion on that, your cat is really, really cute :3 have fun growing and whatever you do, don't give up and keep growing