It’s a deficiency, none the less. It could be a nitrogen, could be magnesium. What you do know is that you’ve been feeding her water only and you now have deficiency. Feed her a little and go from there. I think I heard her crying. Lol
They’re yellow because she lacks Nitrogen. Because she’s trying to root herself. Because you either planted directly or transplanted way to early. She can’t get Nitrogen either because your not giving her any or because your leaching it out into all that farm land You planted her in.
That is...
What you have there is a Nitrogen deficiency. Piece of cake. Your plant isn’t growing because it’s growing roots. ( which will explode within a week) providing your feeding at least 600 ppm. Shed some light on her and lower that light down 6-8 inches as long as it doesn’t burn your hand your...
How about planting them in CLEAR drain hole cut solo cups planted in your outdoor medium. This way just pop the sucker out of the cup once you SEE the root structure is big enough.
She is overwaterd and has Mg issues. No problem. First of all that is not a seedling, it’s a plant now. Feed accordingly. A bottle of botanicare cal-mag plus (a quart is $20) will solve that. Coco is naturally deficient in these elements, so you should flush your coco with 10ml/g to prep Before...
Don’t skimp on your lights. Also, if you plant your seeds in clear plastic cups with 7/8 snips on the bottom and put those inside red solo cups to catch the overflow. You get a better idea of what the root structure looks like. No rot.