How often do you have to replace each thing in the Aquaclear filter?

Question by iluvmypets: How often do you have to replace each thing in the Aquaclear filter? I am going to order an Aquaclear 20 filter that someone recommended. I want to order some replacement foam, activated carbon, and biomax when I order the filter, so I need to know about how much to get so I will have enough for a while. How often do you replace each of the things? Thank you for helping. The fish tank I am getting is 10 gallons and it will have a male betta in it. Best answer:

Answer by Dawn B
It depends on
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