when do you start feeding in coco?

Hey everyone. I am germinating a white rhino seed. I will be growing in coco. I have grown a few plants in soil. I was wanting to know when do you start feeding a seedling in coco? any help would be great.

I wait til the cotyledon leaves start going yellow,this is a good sign that the plant is running out of food.
This usually happens around 2-3 weeks,IME.
GL.

1/4 strength once you start vegging, then up it by a quarter every week until flower.

i recommend u start giving her about 300 ppm of a nitrogen rich fert after it forms its first set of real leaves.

There really isn't any need to feed before it starts vegging. Its happy to grow on water alone. If you get yellowing then add a tiny tiny ammount. If u really want to feed a seedling I can recommend formulex from growth technologies. It's excellent. Just wait for the first real leaves to be full size before you start with formulex.