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I just bought a new filter. Right now I have my new filter & old filter in. My old filter is a cartridge, so I can't transfer the old media into my new filter. Any suggestions on how long I should keep my old filter in? I want to make sure my new filter gets some good bacteria in it before I remove my old filter.
 

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It's best to leave both in for three to six weeks. Some do less. To shorten the time you could get a bottle of Seachem Stability and double dose on Day 1 and single dose Days 2-7.

Unless between the two they are taking up too much space I'd continue running both. That way if you get another tank or need a hospital tank you can transfer one of them. Also, if one conks out you always have a back-up cycled filter ready.
 
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