Living soil Vs mineral nutrients

Week 4 of my tester girls. Lemon Zkittles by BreedBros. Ladies are growing without any issues, they have bigger, and thicker leaves, and indica structure, I assume they will remain on compact side. They react well for training, and creating nice thick branches. Pistils are showing here and there, so we are entering stretch phase. Temperature 29°C day, and 24°C night. Humidity 80% Next week I will start to feed them, or at least the one in Lightmix. One of her leaves is turning yellow.