Going from soil to Dwc would stress the plants and couldn't take that in there current condition I doubt either pic soil or Dwc. once in soil if then transferred to Dwc will increase chance of contamination and root rot once in Dwc. Wich would also spread to any other plants you had I'd there...
What medium where you going to use in the Dwc still haven't answered. were you planned to keep in rock wool you can't just put the roots in the Dwc without a medium. U need need to get it in the Dwc I would say you can give it all the nutes in the world but it won't make use of them at the...
Definitely don't start with full nutes if you're going to start now starts small and work your way up. Ppm should not be that high in seedlings stage more around 200
PPM for Hanna Chart PPM
Seedlings, Early Sprouts 100 to 250
Early Vegging 300 to 400
Full Vegetation 450 to 700...
I think there is just to much rock wool I bet there are a couple inches of roots there where you planning to keep in rockwool all way through. If bit I would gentle break the rockwool apart until you see a root then transplant to the dwc
If you were a true toker you would no that thoughts can pop into your head 5 minutes after writing and pressing reply on on this site providing the info you did are u likely to get another useful response quickly
Just thought as well if has only just started and you haven't increased water atall could be that it's root bound looks fairly small that cup I was surprised on my first grow how quickly the roots grow in first few weeks if that's a cup the roots will hit the bottom within a week
Looks healthier than my dodgy one and this is it now still bit droopy cus I continued to water to confirm it was over watering . this is 17 days from germ is the dodgy one in the previous pic