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carbon filtration

  1. Removed carbon filter in Fluval 305...what to put in its place?

    Beginner Freshwater Aquarium
    Hey all, So in reading around these forums it was brought up that removing the carbon filtration would help liquid fertilizer to work better. So I did. My question tho, is that there is a whole tray in the filter now that's empty. Should I put more of the "pellet" for the good bacteria? Or...