Thank you very much!
Seedling soil mix: substrat Klasmann Potgrond P, 20-25% agryperlite (i don't know the name in english, but it is the light white balls from vulcanic soil, expanded), 3 gr/liter Leonardite. No ferts.
Transplant soil: substrat Klasmann KKS BIO, 10% agryperlite, 5 gr/liter...