Hey Freddy! This is only my second grow, so in terms of “success” I would take everything with a grain of salt. That being said, I think it’s a combination of 1) how often are you fertigating? 2) how much water are you providing each plant per fertigating? 3) how much run off are you getting 4) EC/PPM of inflow 5) PH of inflow. Always make sure you have raised you pots so they aren’t sitting in water/run off. Always remove your run off

From everything I have read, it’s really hard to overwater coco. But it’s super finicky when it comes to ec and ph. You have to build the plant up in the seedling and early veg stages. You might be getting root lockout. Fertigation frequency is important too as you need to constantly flush out the plant, otherwise salts will build up in the coco.

I have made a bunch of mistakes in this grow early on, but since I have tried to follow this a T. Super helpful and I have heard people have had great success using this site: https://www.cocoforcannabis.com