The point from seedling to start of flower is predetermined for the most part. That's why I don't really mess with them in this stage, they're on a clock and if I were to top/fim etc I'm just taking a chance. I just don't over water, make sure environmentals like temp and humidity is ok and let it grow. Once it has developed its 1st/2nd nodes I start using 2 tsp of grow big per gallon of tap water, then if they take ok I increase to 3 tsp on every other water, then every water with monitoring. On my 1st grow I used bottled water which was a mistake, it is void of important nutrients. I got a couple gallons of tap water airing out for a week to release the chlorine before I use, but tap has most importantly calcium. Sometimes the timing of flowering can be affected by something the grower does (ie over water, topping etc).. That's why on Autos I learned to just let them be. This year is my best grow I avoided all my past mistakes..