Growth seemed to really increase once the first node of jagged leaves sprouted. I still have not added my nutrients because I am not sure when I should add them and which ones if the 3 I have to use on a Autoflower plant in general and this young.
I would suggest now.
Whatever you have use 1/2 - 3/4 as much as it says on the bottle at the start then slowly start to increase the potency of your nutes. be aware of your ph.