First grow Green crack auto

Hello this is my first grow of cannabis here is the progress i do have an issue. It is an autoflower to minimaze a stress i planted them sttaight into final pot my problem is blueberry auto is making new leaves as you can see on the picture but why doesnt it make them bigger i started using ferzilizer biobizz bio grow i mixed it whit 1.5l water and 1.5ml fertilizer i do have another fertilizer plagron alga bloom but im gonna use it in flowering time i am using fertilizer every other watering because its coco coir i water like this day1:only water 1.5l day2:1.5l water whit 1.5ml bio grow and then repeat and plants do have 12h of straight sunlight plants are under the greenhouse near chillies am i doing anything wrong? Thanks!