03-26-2011, 02:22 PM
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Originally Posted by turtle10
Actually the reason fish die in a cycle is because of the spikes in levels of ammonia, nitrites, and nitrates. Those are harmful to fish, they don't die because they are without them.
Taking the cartridge out of the 30 will harm the cycle because most of the bacteria is in the filter not the glass. Plus the water has to run through the bacteria in the filter to be cleansed of the ammonia and nitrites. So the filter is still necessary. Changes the filter media will completely restart the cycle.
Original poster, I would do what Thoth suggested.
Random question - But is the best way to change a filter cartridge (It's almost falling apart, so I can't just rinse it), to put a new cartridge in with the old one, and after a while remove the old one? That way the bacteria can build on the new one.