Hey dude. Yeah that is the preferred method
I use Nitrosol (a fish extract) but im sure there are plenty of different brands out there. It sounds like you are using a system pretty much the same as me, green for veg, purple for flowering. These concentrates pretty much cover all your plants nutrients, but i found towards the middle of my veg stage that some of the top leaves were yellowing a little and curling upward. I gave it some nitrosol and bang, it was fixed the next couple of days

We carry different products here in NewZealand, but I know the US will have plenty of similar brands

Cheers.