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It looks like my best plan of action would be to swish the current filter in old tank water each week until the levels in my tank change (meaning the carbon is no longer doing it's job), or until the filter no longer comes clean from the swishing. So I should definitely have it longer than 3...

The filter I have is the one that came with the tank, I'm not sure how else to name it. I'm using the API test strips, so I realize my readings aren't the most accurate: Nitrite levels are 0, Nitrate levels are between 0 and 20 (they're a very pale pink), and Ammonia levels tend to be around...

I'm seeing alternate advice on when to change filters. I have a 2.5 gallon tank with a small Aqueon filter. It's been three weeks, it's turned a light brown, and it's starting to smell a little. My upcoming water change/gravel vac'ing is this weekend. Should I totally change to a new...