[hard_hooker]

My water is finally cycled after 9 weeks of daily water changes.

I need to change my filter however I thought the good bacteria lived in the filter. By replacing the filter cartridge don't I interrupt/break the cycle??

I have a 30 gallon tank with a tetra whisper 30 filter that uses a bio bag with the cotton and charcoal all in one system. What's the best way to do this?

Thanks
Tom