Yes you can, what do you need to know about nute ratios? I like to use PPM instead of EC as that the meter I have. I like to run them at around 600 -800 PPM when beginning vegging taking them up to 1000 PPM. When I flower I kick it up to 1000 - 1050 PPM...
I use Nutrient first, then I add my additives... PPM goes on the nutrient not the additives...
Anymore questions, please feel free to throw them my way... "-)