You have 800w of hid over that little thing? Bro you only need a cfl at this stage, or a 150w mh at most. Because you have cooked it with high light intensity it it very sick and now diseased, stop overwatering ,back off on the lights and hope it recovers, which is very doubtful.
Bro what it that rubbish its growing in? if i was that seedling i wouldn't want to be born either.
Use the best medium for dope as its the best plant, not fucking woodchips.
That old supermarket soil is causing this, not a major issue, increase the feed by 20%. Next time use a quality coco mix fed with quality hydro nutes and they will be green from top to bottom , start to finish.
Bro that soil is rubbish, not 'topsoil' fucking bullshit, its some shit they bag up and sell it as 'topsoil' . Get some hydro veg nutes and use that, but not for a week or two as those sick little things wont be drinking or eating for a while.
Yes this is right. Salt burn from soils and soil mixes. To avoid this use a quality coco mix and hydro nutes made for coco. Nothing much to worry about here atm.
How do you know this for sure???? You didnt know yesterday and now you think problem solved . N toxicity is rare and too much N normally burns the margins. I can see no burn on any leaves.