DaPrawf Posted January 31 Share Posted January 31 (edited) My old HOB filter died and I ordered a double sponge filter to replace it. I'm wondering whether the sponge filter will generate enough water movement to oxygenate the water or whether I need to supplement it with a separate bubbler. (I'm running an undersized regular sponge filter as a stopgap until the new arrives.) Thanks. Edited January 31 by DaPrawf add photo Link to comment Share on other sites More sharing options...
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