Use of kangaroots with ffof soil

Is it useful to use the kangaroots nutrient in Fox farms ocean Forrest soil? I know this soil doesn’t need feed for 3 weeks but I’m just curious if adding this will help root structure

It should be fine. Myco and Microbes. But it does have some nitrogen.

Ok any advice on how to use it? I mean at the very beginning I water with very small amounts I’m just unsure how to use it early on cuz that’s when it says to use it anyway

If I was going to use it I’d use half the suggested dose per gallon.