When to transplant seedling?

First grow. Feminized autoflower under 600w led. Germinated in 1.5" rockwool and planning to transplant into 5 gal dwc. Currently 9 days old and is barely starting second set of true leaves. Roots are just barely poking through bottom of rockwool, maybe 1-2mm.

First, do I need to wait until the root system has grown out of the bottom of the rockwool further before transplanting to dwc?

If I do transplant, is now the time to start the "seedling" nutrients schedule? I'm use the GH flora gro series. Or should I just use PHd water for a certain amount of time?

First grow. Auto. DWC. Holy smokes. I liked your post so you lose the new member tag. They’re more willing to help a veteran making these decisions.

Did I say something wrong? Why would people not be willing to help a newbie?

No they’ll help. There’s a bunch who did likewise. You didn’t say anything wrong. Welcome.

You can transplant it to your final medium now if you water by hand till roots extend

You’re now locked into home for the duration. No going away for the weekend. For one thing.

No problem there. This is my new hobbie and I'm a homebody anyway. I check my plant 3 times a day (and refill humidifier) morning, afternoon, and evening. The light is off between 10am and 4pm while I am working