Not one person can know everything. A lot of people know a lot more. When it comes to a good grow. Do lots of reading. I'm still learning.
I am condidering either canna of biobizz soil or coco. What do you dislike about coco? Seeds have arrived so im dying to get started now
I'm not a great fan of feeding seeds and seedlings for awhile after having read about them as most of their nutrients are stored in the shell and cotyledons which should last them the first 2 or 3 weeks. I did add a miniscule amount of Canna Rhizotonic for my latest batch at the seedling stage just to help their roots progress, but less is more in all cases of feeding imo. 5l they'd be dead surely lol, I'm not throwing 5l of anything other than water or water mixed with nutes even in full bloom