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sponges

  1. Changing sponge over?

    Beginner Freshwater Aquarium
    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...
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