Although I don't have any personal experience with coco, almost everything I've read says to treat it just like hydro in the sense of pH and ppm and nutes, and since it holds a bit more moisture than hydroton, it should be watered a little less.. It's one of those things I'd love to try when I have a little more room and can afford to experiment a little.. I try to shoot for a pH of 5.7-6.0 for the sake of drifting.. Since I use 100% rockwool, the pH tends to stay put relatively well, but I imagine if coco is a type of hydro, watering and pH adjustments are much easier to work with than with soil..