GW, not sure if you’re organic or not, but there are organic liquid nutes too. It’ll help your current grow and it’s good to have on hand.
When you get advice to use molasses, be careful. First, plants don’t take up sugars naturally. They produce them via photosynthesis. Putting sugar in your soil can have unintended effects, like death to your girls. There is no scientific evidence molasses does a damn thing. It’s an urban legend that has far more traction than it deserves. Then again, the election was stolen according to some who will believe what they want, so there’s that.
If you’re ok using the FF stuff, I’d buy it. Learn to grow with it. Decide later if you want to change up your technique and go full send on the organics and really build a nice soil. Nutes are just one part. Your lights are A#1.
Enjoy your grow. Good luck!