Hey! Someone more knowledgeable will probably chime in after me.
seeds don't require any
nutrients to germinate. After they sprout and have a leaf or two or four they generally need MILD amounts of nutrients. For baby plants, I generally go with 10-20% the recommended strength for mature plants. Once they start getting larger, then you increase the
nutrient strength. Baby plants and sprouts can get burned on too strong of nutrients (don't worry, they are pretty hardy).
When you're plants are big enough to transplant into your system, I would assume they will be requiring nutrients when they get moved in. Probably a diluted amount.
Just wanted to comment so you weren't left hanging, hope I helped.