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Sponge filter and air stone


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Hey everyone,

I purchased Aquarium Co-op’s nano sponge filter along with the air stone found in the store. I’m looking to attach it to the sponge filter but it does not fit. The opening in the filter is too small companies to the one on the air stone. I watched Cory’s YouTube video on “How to Optimize and Clean a Sponge Filter” and I’m certain I’m installing it the same way or am I doing something wrong?


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