Idk whats going on

K P def

try the appropriate amount of bat guano mix to spring water. It should help during your seedling stage. Don't overdo it!

Hey there your light intensity is to high I know after theybstart tinget a few leaves it's temping to turn the light up. Make sure to transplant when 1st set if real leafs has grown in this will .make the plant grow out larger Make sure to not put ppfd above 200 to 225 for a good amount of time you want atleast a cm between each node when you have the light so high everything just gets all grown on top of

As mentioned by others, it needs transplanted. You would be amazed at what transplanting into fresh medium can do. Idk what final pot size you plan to grow in but if it's a 3-5 gallon, you could transplant right into it now. If you're using Pro-Mix HP, it does not contain nutrients and feeding should start around day 7. Be careful with dosing, plant is to young for a veg stage dose. Always start with lower amount of nutrients, deficiencies are easier to correct then toxicity IMO. If you're using Pro-Mix that comes in the black bags from like Walmart, that does have nutrients in it so feeding may not have to start until later. Make sure you're not giving a ton of light at this stage and don't let fans or humidifiers mist blow right on the plant. Also try not to get any water on the leaves, they can do all sorts of weird things if they get even a little mist on them.

Need to transplant..and always ph the water. Definitely looks exactly like symptoms of incorrect ph.

Root issues due to growing in a cup that is waaaaaaaaaaaaaaaay too small for two weeks already. Cups that size are only just barely adequate for about 5 days at most.

Alsonstart nutrients soon promix is a very light substrate and will require nutrients earlier than

Ypu need to ph the water always tap water is very alkaline