also just to let you know, that soil you are using looks like..well shit...soil for MJ should NOT have wood chips in it....smh..it reslly shouldnt even be brown colored, it should be black with some perlite mixed in
also those plants are still way to young for nutrients, i understand they have fan leaves but they are just BARLEY out of the sprout stage, no nutrients are needed, your just wasting them and potentially killing your plant.
if you need help im sure someone could help you out. you still have alot to learn, im not trying to hate...
ps. looking closeley at your video now, your seedlings are already turning brown on the tips from what looks like excess salts, you are most likley going to kill them if your give them anymore nitrogen....good luck dude.