do any of those people know how to grow in coco?
if you are using proper coco practices they will def pull through
if you are using soil practices as is the case all of your plants may fail
in order to see positive results it may take a week or so to show
but the effected leaves will not recover
I will post a video of an owner of a nutrient company talk about coco and soil
please be very mindful of what he states. These are my practices and they have never failed me ever
I start my seedling @ 1,5ec
and they get that the entire life
I water every day to runoff until the start to dry rapidly
then they get watered multiple times a day
and as what Bicky Studs stated
keep them heavy and watered