Hey Bobby3156!
You want to have nutrients in your water each time you water your coco. Coco is considered a soilless medium like hydro and doesn’t contain nutrients.
My waterings pertain as:
Seedlings: 100ppm megacrop (my choice of base nutrient), 150ppm calmag total:250ppm
Early veg: 150ppm calmag, 300ppm base nutes total:450ppm
Late veg: 150ppm calmag, 450ppm base nutes total:600ppm
Early flower: 150ppm calmag, 600ppm flower nutes, total: 750ppm
Later flower: 150ppm calmag, 800ppm flower nutes, total 950ppm. I sometimes go higher depending the strain.
Harvest time: I feed 0ppm water for a few days before the chop.
Cheers!