@ObserverInterest, Hi, honestly before I use stretching, but I give up it and keeping flower up till 4 weeks veg and not pay big attention on growing. Time ago I mix my own super soil mix and this soil I using already second growing time and plan to use it also next growing time to check how super soil long could be useful. No nutrients at all only I keep constantly O2 feeding for water which one I using for watering. I realise nutrients not essential if soil is enough with own nutrient. I could add on blooming time some blooming nutrients, but it’s messy and cost extra and this reason why I growing it maximum organic and doesn’t matter how much yield I will achieve.
Have a nice harvest buddy.💚