If you have the room you can’t go wrong with the dual reactor and mj1200 setup BRS sells. I sprung for the upgraded silicone hose kit for it as well. A lot easier to install and maintain imo.
Hmm, I've heard and read that GFO is useful but very expensive given how quickly it exhausts itself. Have you considered an algae reactor instead? I believe they accomplish the same goals.
FWIW, I have a gallon of the BRS GFO brand, unopened for sale. Located in Malden.
I already have an algae reactor. My tank!! Hopefully I just have to run the gfo for a few months to get the nutrients and check and water changes will take care of the rest once the algae subsides