IMO - The key to carbon is to run small amounts of it and to change it frequently. There are probably as many different opinions on the use of carbon as there are types of carbon, so find what works best for you and stick with it. Personally I don't run it all of the time but when I do use it I use about a cup and change it after a week to prevent anyhting from leaching back into the water. I usually will drop in some carbon if I notice my water starting to yellow and needs some "polishing".
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