let me clear up the part about my 1 day old seedling:

after it popped out of the ground it was growing fine. i wanted to make sure the ph was
on point so i ran some nutrient solution through it and the runoff came to about pH5-5.5
so, i used a few cups of plain tap water until the runoff became pH6.5-7 then ran some nutrient solution through
it again until the pH of the run off was the same as the nutrient solution's pH which was around pH5.5-6
and now i've noticed that the cotyledons are curling down

from what i've read it's overwatering but i don't understand, it can't be since i'm using coco as well i have many holes
on the bottom of the container to allow air flow through the medium from the top then out the bottom or vice versa
what would you think it is?
and i used a very light nutrient solution, recommended dosage for seedlings according to the container instructions
maspino1 Reviewed by maspino1 on . Someone please confirm my hypothesis: My plants started off green and vibrant. Then: -I noticed grey tips on the bottom leaves which turned yellow plus twisty bottom leaves -After the yellow they (the tips) turned brown -After the brown tips the whole leaf started yellowing -So I flushed and left it for a day -The day after I flushed again with pH'd water (1gallon; container is 14oz.)and immediately nuted with pH'd nutes (you know, like i add the nutes then ph the water) with recommended dosage for seedlings -Now the Rating: 5