how close is your light could you lower it a little and do you have a fan blowing on the plant to help it get stronger and also helps dry soil out I would not start over you need to fine the problem correct it and keep going or you will learn nothing good luck
go to garden store or agriculture store for field lime if you want something like cal\mag get dolomite lime put on soil water it in or put in water shake it up and then water
your welcome the only difference field lime and dolomite lime they add mag and other minerals in dolomite 50%lime 40%mag 10%other minerals take dolomite lime add water shake it up you got cal/mag
3 2 3 lights 30x30 frame 10 inches apart center to center for outer rows put the 2 in the middle spaced between the first and middle row and other between middle and third row
filter then light then fan. fan can be out side of tent theres no problem with that since its a air cool hood why do you need ac air in your tent is the room that you grow in that hot maybe that's why your having trouble with seedlings to cold with ac in your tent
you should of put off the grow until you had the money or you live far from people the smell might get you busted ona gel will get in your bud and have a bad taste it and will not cover up the smell on good smelly buds
if your soil is moist now lower light if not water it and lower light and don't water till its dry if you have a small fan but it on low to get a little air movement helps make plant stronger and with drying out soil a little
I would try 10 maybe not to sure with though led I don't want you fuck your plant up more did your problem start in the jiffy pot and organic soil or when transplanted to ff
you could mix it with your water or sprinkle a little on top of you coco and water it in not 100% sure I would say about a 1/2 to 1 cup full to 5 gallon of coco now for understanding im talking about field lime not the lime on a tree
im thinking the light should be closer a new seedling yellowing is not enough light or to much water I just looked at them again they don't look stretchy and they don't look wet what is the soil there in