Look up the Lucas Method if you are looking for the NPK that it actually needs. Or just use pre made bottled nutes made for coco, they have it right, but go like half strength at first.
Used to be 15 15 30 then its 15 30 15, everyone has an opinion. Mostly need to focus on Ca and Mg in coco, its easy to get lockout if it is not buffered with CaMg to start and added regularly with feeds.