MichelleN Posted October 30, 2020 Share Posted October 30, 2020 Question: When stacking sponge filters is the air stone placed in lower or upper sponge? Link to comment Share on other sites More sharing options...
Streetwise Posted October 30, 2020 Share Posted October 30, 2020 Based on this, I think it would go at the top: Link to comment Share on other sites More sharing options...
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