I have a nextreef mr1 monster and a super reef octopus br-140 media reactors. I'm going to use purigen in one. The other I haven't decided. I was thinking about filling with denitrate. Just curious if there was any other better options. Thanks.
On a 75G I'd just run the Monster. Put Purigen in both sides and call it good. Carbon isn't needed, unless to remove medications, and would be pretty expensive to run since you would constantly be changing it out.