Nutrients?

I use biological fertilizer and i start 2-3 weeks after germination and i never had any problems. So i would say you are definetly fine with 4 weeks 👌🏼👶🏻👌🏼

if your going to add nutrients, start on a half dose. You can always add more, but never take back what you put in

Definitely! Bagged soil typically only feeds for about 4 weeks. You are right on schedule. Good luck 👍