Dude you can use any sized pot you want but remember coco dries faster than soil use the nutes your comfortable with as your trying something new might be better to keep it as simple as you can the ph in coco for growing you want between 5.7 and 5.9 and in flowering between 5.9 to 6.2All my pots are 3 gal is that to big for coco ?
Tried them you still need calmag just not as muchAlso if your willing to spend more money on nutes Advanced nutrients do a ph perfect sensi grow and bloom specifically for coco which has added cal mag. Can make things very easy.
I have sensi grow and bloom not the coco one but I will get it if it's better even with ph perfect it's not perfect by the time you mix root grow and bud builders my ph would be 4.6 to 5 I would bring up 6 to 6.4 for soil that perfect is not perfect in my eyes now sugar peak has done me the best out of all my grows on the frost in my eyesAlso if your willing to spend more money on nutes Advanced nutrients do a ph perfect sensi grow and bloom specifically for coco which has added cal mag. Can make things very easy.
Do they ever get just water? Or feed feed feedI'm with wile any size container. 52 oz cup all the way up to a 4x4 flood table. When their small, first 2 weeks I like to mix up a 5 gal bucket of solution. Just makes hand feeding a little less tedious. Then drip or keep hand feeding just up the amounts. It really isn't so different then what you have done in soil. More cal an mag and feed more often.