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I am taking a filter out of service and putting a new one in its place. Because of the beneficial bacteria on the old one I'm afraid I'll mess up the water specs if I remove it. So in the interim I'm running both filters in the tank. How long do I need to run the new filter in the tank before I take out the old one?
 

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Or put the new filter in place with fresh media...

...and place the old media in front of the new media to "seed" the new media...
 
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