06-07-2008, 11:08 PM
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Activated carbon "runs out" after a while. I save mine for when I need to medicate the tank because after you're done medicating, the carbon can be added to the filter to remove the medication from the water. Some people also believe that activated carbon removes helpful chemicals from your water that could benefit the fish, and some people also believe that activated carbon causes or contributes to hole-in-the-head disease. It's still a topic of debate, but since it's definitely true that the carbon becomes useless after being in the filter for a few weeks, I choose to just leave it out and replace it with something else, like filter floss.