go for the refractormeter they are way more acurate, which is very important especially in a nano,
oh, personally i dont think that will be enough flow, i have 2 canister filters rated @ 300 gph in my 18 gal, and theres noooo way thats even enough flow, looking for a sieo 620 to drop in there as well,
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Why are red buttons always the most important?
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