You can do either way. But I think I would feed from bottom a little bit, to get some saturation, then top feed to get the rest moist so it wont just just run through unless you water it real slow. Then depending on how you water coco, I would top feed or bottom. If you let coco dry out between waterings then bottom feed, if you don't let it dry out then you would top feed. Also, upon transplant I would bottom feed only to encourage root development. Or water up to the level of the top roots.