Hey bro! 👋
This is definitely a problem with nutrition and lighting schedule! 👆
1. You set the acidity for your substrate correctly; it should be at a pH of 5.8.
But you need to reduce the coco grow addition (1ml/l) because it has too much nitrogen, which is evident in the bright green leaves with dark tips! Nitrogen blocks phosphorus absorption, making it hard for the plant to bloom! 👆
You need to get a bloom additive and apply it (3ml/l). The ratio of grow:bloom should be (1:3).
2. You have feminized, not auto; it needs a lighting schedule of 12/12 for flowering!!!
👌😇
I hope my answer was comprehensive! Good luck, buddy! 👋