I've had better experience using the ceramic rings personally. The mini size bio balls aren't bad but the ceramic rings like fluval sells have more of a porous nature to it to maximize bacteria growth, a little easier to clean as well.
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1x 180g - 1x 75g - 4x 55g - 1x 29g - 1x 20g - 1x 15g
Geo's - Cory's - Loaches - Ram's - Firemouths - Convicts - Endlers - Tetras - Plants - Jack Dempsey's - Shrimp
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