Nice looking plant man. Are you sure that it's vortex? I haven't growd vortex before just wondering if you mixed em up.
What else do you have there? I see plants in the background.
Maybe you're keeping it too wet?
And too high ppm's.
This has happened to me.
My ppm's don't go much higher
Than 650 in coco when I use synthetics.
Oh, and maybe quit the super thrive.
If they haven't broke surface yet, leave em in the dark,
and check on them in 12 hours.
do you have a heat pad? Or leave the set up on top
of your cable box. That'll work too.