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Cycling New Sponge Filter


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I'm sure this has been answered a zillion times, but couldn't easily find the answer on the forum.  I preparing to upgrade my Betta's 3 gallon to a 9 gallon.  I have the future new sponge filter running in another older, fully cycled 5 gallon tank.   My question is about how long does it usually take for the new sponge filter to get "seasoned" with beneficial bacteria from the older tank so that when I set up the new 9 gallon, I've got a chance of avoiding new tank syndrome?  Does there have to be visible gunk?

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