How soon do coco plants get nutrients and how much?

Used paper towel to germinate. Added to small cups of coco (premixed bag 70/30 coco). Now seedlings have come up through coco and are receiving gentle CFL light. The soil was moistened for planting with ph’d water with a small amount of calmag (1ml per gallon). My question is when to start nutrients and how much? Also should I always have calmag in my water and if so how much at this early stage? Keep in mind I mix 1 gallon at a time, although I will not use near all of it. My nutrients are Coco A and Coco B and added to water in equal amounts.

Feel like this is a duplicate thread. The other one has this answered. As to when to switch to normal feed is up to you most people and manufactures say one week of weak feed. I personally feed seeds and clones full strength flowering nutes from day one.

If it aint right it will be fine for a while then quickly show over or under fed. Just dial it in and I personally never change the ec when I find that sweet spot. Like other thread said calmag depends on water source but I never needed it. Even with ro water but I was using a diff line with more calmg in it vs maxibloom.

Youll know if you need calmag, why and how much exactly otherwise it easily creates lockout. Usudally people add a minor amount.

Planting seed method vs papertowel is a good question what to do until it sprouts but that was answered on other thread.

You can find answers to your questions in your other thread.

Seedlings and coco questions???​

Regarding the calmag question........if you're using tap water you may not need calmag........I never use it.