If you do pure coco, do lots of homework, starting here in the coco section! It cannot be treated like true soil, or shit will go sideways sooner or later,.. coco is a specialized soilless medium, requires a lot of labor, constant pH and TDS readings going in and out, 15-20+% run-off each time,... done right, you can grow monsters in small volume pots, but you will work for it unless you use drip systems,... Oddly Autopots seems to do pretty well with coco,...
can you get Roots Organics soil, or Black Magic? Royal Gold King's mix is great, my fav' but not always readily available,.. I get the frustration!