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Discussion Starter #1 (Edited)
I was wondering how do i switch over to new sponge in my filter without cycling again? and when should i change my sponge over e.g every 6 weeks (its does have activated charcoal) I haven't done this before.

I just realized i accidentally put salt water for my topic my tank is actually tropical freshwater
 

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Exactly what kind of filter are you using?

I despise those ones with the cartridge that has the carbon in it. I have a filter that requires this cartridges. I took a sponge from an AquaClear filter and cut it to fit and use filter floss with it. If you just replace it you do discard all your beneficial bacteria. This is why I don't like them.

I guess you could cut some of the old stuff off and place it in the filter with the new cartridge.
 

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Just rinse it off. The carbon is only good if you are removing chemicals or meds from the water. You only change your cartridges when they are falling apart!
 

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Discussion Starter #4
Kk thanks, so would my tank have to cycle again if I do that?
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