My brs reactors were junk. They would run fine for a few days after changing media and then clog. Don't waste your money. Get the next mr1. Also I ended up not running gfo at all after it caused more problems then it fixed.
I keep ROX on hand in case, but other than super polished water, I have not noticed any difference. I am always weary of allelopathy though.
Next time I'm going to try the HC GFO, the low cap works but if the results could be even better, why not?
-You had me at PWM
I'd check out the Innovative Marine full sized reactor they're coming out with. I just got the mini-max for my nano and it's way nicer than the nextreef reactors. I like the nextreef reactors as well, but the design on the IM reactors is well, innovative. It makes adjusting flow and changing out media super simple.
Master Reef Curmudgeon