I see a little yellowish girl,
that means you havent found the balance on the feeding/// ph// wateringregime
but out of the yellow she looks fine
atm 2 possibbilities
A) feeding dont has the right PH... Plant can take in the Nutrients
B) feeding is to low in nitrogen
and you can always take in somee calmag ( without nitrogen // or calculate the EC)
https://www.growweedeasy.com/coco-coir
I previously finished a miniature grow with 10 gram of soil, and i had tto learn to keep themm happy
in controling the food and wateerinput
aand thats the same here, yoou got to get used to the handling, dont give up...keep on growing