GvXThCanswered grow question 6 years ago Hi there! Cannabis plants doesn't need too much fertilizer until three weeks, at least. Having in mind that you are using soil, it's not necessary to feed your seedlings at all during first three weeks.
However, you can use safely bio-stimulants like humic acids or algae extracts, and eventually little doses of root stimulant to encourage root development.
I hope my answer was useful.
Have a nice cultivation.