A good place to start would be with Canna Coco A & B nutrients or RealGrowers Grow Dots for all the essential minerals needed. Adjust the water/mineral solution pH to 5.8-6.2 for coco.
10 gallon pots is really big for coco I would max go 5 I run 1 gallon pots drain to waste and end up with massive plants like 3 foot wide by 6 feet tall
25 plants in 10 gallon pots, Bro you better have a warehouse to grow those monsters. I would run extended grow dots to make a 10 gallon pot worth while with coco.
In a multi-feed drip system I’d go for a 0.25-0.4 gallon of coco per square foot, no matter the plant count (1 plant in a 3×3 i’d use a 2.5-3gallon pot).
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