Double buckets as far as I know was posted by me and is only a way to drain your coco run off. I'm sorry to say you do not have the right combo of nutrients for growing in coco or any other medium for that matter. Your feedings do not contain enough Nitrogen and your seedling will die soon unless it gets some. You need Canna Coco A+B nutrients @ 1 ml / litre and cal mag @ 0.5 ml / litre.