Sorry to tell you but what ever you were reading is dead wrong those are both organic potting soils... And about the best you can get.
I've started over 50 seeds in it with a 100% success rate and my seedlings have NEVER came close to burning they just love life and thrive.
As for Nutes I've used fox farms it works good but its an incomplete line so I switched to Botanicare and It's worked very well for me...
Check out my current grow using both these products.
https://www.rollitup.org/t/wickeds-3-incredible-bulks-under-dual-p450-leds.922546/#post-13089492