seedlings and cuttings 400-600 ppm pH 5.5-5.8
week 2 from seed 1000-1200 ppm "
week 3-4 1400-1600 "
flowering 1600-1800 ph 5.8-6.1

this is a general idea. Your resullts may vary. some nutrient brands fare well at this level to cannabis, and some may require less.