I don't know where you are.......

I am in Vancouver area and we can get Fox Farms Ocean Forest here. I use it exclusively, never reuse it. I also, because it is such good mix never give growth nutes.....I repot....sprout to 4", that to 1/2 gal, next to 1 gallon, then 3 gallon until done. Potting mix is my fertilizer.

I have found that giving nutes is very risky and I believe if you are not very, very careful you will have problems.... Repotting cures that.