Long as your getting some drainage to avoid salt buildups, or go to a feed then water cycle should be a problem at all. But if going organic. I would generally assume the bigger the better.
Coco is pretty much totally inert or damn close to it. It's even more inert then peat. It does not have enough on its own for micro flora to thrive no. But if your running organic feeding regiments that shouldn't matter much if any. Salt, organic, either way, pretty much 100% of your plants nutrient requirements will be met with the feeding solution alone.
Beautiful ladies btw
