When to start nutrients

Im currently in a 12/12 form seed grow, and I'm wondering when to start nutrients. To see my progress look at my journal link in my signature (I'm now on day 20)

Unless your soil has food in it. you can start them now if you'd like, just go weak, like 1/8 strength.

At almost 2 weeks I start with 50 ppm grow mixture and up it every dosing by 25 ppm. I use fox farm ocean forest mixed with fox farm light warrior soil 50/50. My soil has nutes in it but I see yellowing from nitrogen deficiency right around 2 weeks.

I give my Russian comfrey fert, which I know is 100% organic, to my sprouts when they show their first single finger leaves. When they show 5 fingers I add some BioCanna.