Hi,
You probably want something smaller than a 200 or 300 for Carbon. The supposed flow rate for effective carbon use is 50 gph...so that's the smallest one. For more effective use of carbon, something like Fluval 1 is more effective. That information is based on some articles on RC and Aquarium Frontier - that article also discusses the how much carbon is truly required to effective remove DOC. It is much less than one thinks - a tblspoon per month is good enough for a <50 gal.
- Victor.
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