when you planted seeds did you plant with root up or down,just saying for some stupid reason ,when you plant with root down it has to reroute the root to go up and then it turns and heads back down into pot,cant explain it but it does.
so if you planted root down it will take a little longer but it will be alright, dont feed nutrient until sprout leaves fall off then start if you have to ,it all depends on what your growing in ,soil is diffrent from coco, coco you feed from the start ,soil is another ball game,if you bought roots organic or fox farm ocean there is plenty of nutrients in there for a while anyway your babies will let you know when it is time, if you run soil ,my favorite by the way,depends on how hot your running ,if you build your on, you sometimes cant put a seedling in there until it matures a little ,if you run no till all them little microbes be in there making a perfect condition for you ,you go straight into it ,mother nature pops up and does everything for you if you got the soil right ,if sweet you then just feed water and tea.
i know people that use both roots and fox farms most dont even feed nutrients until 3rd or 4th week.
so it really all depends on which way you want to grow,hope i could help a little with all this gibberish ,hope you can make it work for you friend which ever way you go