Young plant getting a bit too yellowish pale

Add some CaMg into your feeding because Coco holds onto it and only releases it at maximum holding capacity and when you water give enough until you get aprox 20% runoff this will prevent build up and stop a lot of issues from happening. Other then that your plant looks good 👍

As already said that ph is low I run about 5.9 in coco. I would also say you only need a A and B and maybe add 0.5ml per L of cal mag, I don’t think much is to be gained by additives at this stage apart from maybe a little root stimulant. A plant that size I would probably be at a EC of about 1.2 ish. Again bumping that up to around that or just under should darken them up a touch.