this is the reason why i say organics and soil isnt good for indoors.
you are playing a guessing game .
using synthetics you know exactly what your plant is getting also why you use a well draining inert medium so if a problem occurs its allot easier to flush and rectify the issue.
in veg to every 1000ml water i add 1ml cal mag then 1ml each of a two part veg nutrient . then adjust ph to 6.2 ish for flower i do the same mix with bloom nutrients and ph to 5.8 ish .
water same time once a day just till run off and you're done .
stop planting your seeds in such a big pot .
start with a 4 inch max then transplant once its bigger plus keep your light 18 inches the entire grow
or seedlings keeping the light close s a better idea so it does not stretch and fall over . as you have already seen happen
once the seeds produces its 1st real nodes the main stem will stop stretching and you can mark down day 1 of veg
seedlings dont need allot of watering probably ever second day i will feed a veg mix at 50% the above veg mix for two weeks then right to full mix what is technically a week mix already.
after two or three weeks the seed should now be more then big enough to transplant to a 8 inch pot or bigger and receive its 1st topping and maybe some lst
then as it grows keep topping and using lst as needed until you have filled 80% of your grow space
then lollipop the lowers of the plant and remove about 50% of the big fan leaves wait 3 ish days then flip to 12/12
keep feeding veg nutrients for the 1st week then change over to the bloom nutrients
feed daily at this point . same time preferably
genetics will play one of the biggest roles. if its not a fem then you run the risk of getting males and wasting 4 months grow time maybe more if it takes a while to show sex
temps and humidity sure play a role but if they are off abit you can get away with it . too much out and you will have issues regardless
not ideal but 45-55% humidity the entire grow will work and 28c lights on up with a max of 30c . that's pushing it . lights of 18c -14c is getting abit low but can still work. thats celsius not fahrenheit
when it comes to using coca coir it need extra buffering regardless of what the bag says . you need to get them catin exchange sits depleted from potassium and filled with calcium or else you will run in to deficiencies . i sock my coir in a strong cal mag mix with water and leave it for 48 hours then allow to drain before planing anything in to it
i could keep going but im bored now . happy growing or trying at least