Mix'ing nutrient brands.

Hi, my girls are 6 days old now, and soon im going to start feeding them with GHe flora 3mix.
But the thing is, I still have a good, unopened bottles of root, anytstress, and witamin mix nutrients from Hesi.
Root Complex, SuperVit and Power Zyme, I was thinking If It would work together and if I would use thoes nutrients only on early stage for better rooting and for vitamins and than to switch for main GHE stuff.
Thanks.

Why yes, they will.

I use different nutes for seedling, veg and flower... no problems. Just don't mix different products together...

I mix multiple brands without issues. Those are root zone products any way.
Good luck.