This girl is about 2 and a half weeks old for my lights I was originally using a crapy $20 Amazon led panel but am now using two sunlike led bulbs i also got from Amazon
What’s your PH in and out?
I’ve been PHing at around 6.0 - 6.5 and I haven’t measured the ppm
You want to be at 5.8 for coco. How often are you feeding?
Everyother watering and I only water when the the top of the coco is dry so she probably gets fed 3 - 4 times a week
Take a read through this article . There is a lot of info here for coco growers