I’ve been using this on my clients grows, effective and easy,
Canna Coco, Canna Nutrient line. Botanicare for Calmag
You dont need a res, I would suggest a holding tank of some sort, you can hand water. rule of thumb for me 5 gallons ready for each plant.
Follow canna chart, go with a medium strength feed. For example Canna A+B, in soft water is 10 ml per gallon.
2 ml a gallon of Botanicare Calmag as late as 2 weeks of bloom, then cut that off.
No res needed for handwater or drip to waste…
5)Yes Canna feed chart works good,
Roughly 25 USD to do canna coco per plant in 3 gallon smart pots for nutrient cost.