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the K2R is way over rated on it's tank size but pretty much any reactor works. down flows like the Knop are poor choices if you use fine media but work OK with the large grain media, they aren't the most efficient with CO2 usage but they'll get the job done. the Schuran is the best for performance vs size with excellent CO2 efficiency. the GEOs are good reactors but i prefer the Korallin over the GEO myself, YMMV.
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