I've only run carbon on my tank for the last month and a bit, I personally haven't seen any difference in my tank, but since I have the stuff laying around, I figure I might as well use it.
BTW, my tank has been running a fuge packed with chaeto since day one. Fish load is somewhat on the lighter side though (2 false perculas and a lawnmower blenny in a 33gallon with 15gallon sump).
-Rich
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