Unknow autoflower

it's always a little bit of a guess with soils... you may need to supplement certain molecules before needing a full spectrum fertilization. all you can do is observe and react. take some notes of what you do and when you do it... if you compose the soil the same way or buy the same soil etc, it should play out in similar ways. you can preemtpively do things based on your notes with good confidence. there's no one-sized-fits-all answer due to the plethora of variables that could be different in your soil than anyonen else's. somem living soils barely need a thing throughout entire grow. slightly burned tips are no big deal, especially if it doesn't progress. i don't see any deficiencies with that symptome without coinciding symptoms, so i'd wager a bit too much p or soemthing but it's good to push upper boundaries. just keep eye on it. if it doesn't progress it is a non-issue.