The Planted Tank Forum - View Single Post - Filling an Eheim 2215 full of ATI hydro sponge
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Old 12-12-2012, 04:59 PM   #5
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Agreed, you want a surface that allows bacteria to grow on it but disallow the collection of debris. Sponges will fill up with with debri and will likely impede the flow of water - which is critical to keeping the bacteria alive and well. Eheim bio balls are second to none really.
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