Planted with taproot showing on August 26th

purple stem... overwatered and or the soil is too hot.

The stem is a very deep burgundy. It looks like a nitrogen lockout in the seedling. Measure the pH of the runoff water; it might be below 5.5. For future grows, I would use coco plugs for germination at this stage.

hi Justin........ The soil you have there is unfortunately not suitable for the seedling...... Get some special soil for this growth phase and your problem will be solved...... Good luck

It's probably just developing the roots it needs for growth.

Not a seedling mix. Soil is wrong.

i don't see overwatering.. i see large portions of medium that looks bone dry, so i doubt it's consistent underneath, either. Also, looks like poor composition with low aeration characteristics. So many possibilities for this... could be temp/rh (therefore, VPD also) not being in a good range. could be too much light -- this would be easy to eliminate as lng as you see some internode developing etc... The pot isn't ginormous, but a bit too big for a seedling at this stage, which makes watering more difficult / complicated. How hot the soil is, is also relevant -- nearly everything someone pointed out so far is a possibility. You'll have to eliminate the possibilities... insufficient info to give a single, good answer. if you can't water in a normal way, it's the fault of composition or using too big of a pot. Use more perlite or similar and not too chunky it physically impedes roots... the danger of partial watering is dry pockets... roots don't grow into dry pockets and nascent roots die in dry pockets. It also creates a context in which the most moisture is at the top instead of bottom/center.. roots turn and grow twoard greater moistuer.. it's automatic. So, partial watering promotes superficial roots. With a large pot /tiny plant, which this is borderline, you don't water the entire volume.. you do a smaller column around the plant but make sure it goes all the way down... you don't want to promote superficial roots. widen the column as it grows until you can water the entire volume in the pot. Fully saturating a pot or little seedling container is not overwatering. This is a matter of poor soil composition. if it remains soggy and waterlogged, that's because it's a shitty soil composition and 100% self-inflicted. Watering should never be an elaborate process unless you willingly put yourself into that position with tiny plants / large pots, whic is also 100% avoidable and unnecessary to do 99.99% of the time - maybe there's a context where it makes sense, but i can't think of one. 1) fully water (10% runoff, if soilless grow method is supremely important) 2) wait for dryback and repeat. It's that simple to water. If doing this causes problems it's due to other mistakes being made. This is absolutely not overwatering. A great way to assess this is how long it takes between irrigations... it can tell you when it's ready for a transplant or if the pot is too large etc... stagnant water is less than ideal regardless of if it happens in a bucket or already soaked into your medium. The rate the plant drinks helps determine the volume of soil it needs to grow well. somethign you can observe and predictable adjust timing and pot size choices.

My first guess would be too much moisture around the root zone, especially with such a tiny seedling in a relatively large container. The downward curl plus stalled growth fits a young root system sitting wetter than it can currently use. I wouldn’t add more water until the area around the seedling has dried noticeably and the pot feels lighter. Keep the environment warm and stable, avoid strong light for now, and give the roots some oxygen. If the stem stays firm and the new growth remains green, it should have a good chance of recovering. I’d be more concerned if the stem starts thinning/darkening at soil level, which could indicate damping-off.

Too much water. Also water around da outside of da potter and not in da center, ya want heat to evaporate da water from da bottom up and to make a neet basin of water at da bottom. Flushin da roots like dat just makes der work harder.

EC of the soil is too high…. This is not a light mix for seedlings