Odd Alan Posted February 3, 2021 Share Posted February 3, 2021 Hi, I've been noticing air bubbles rising from the sponge instead of the tube. There's about 4 inches of sponge w/ the large filter... What's the best placement for the Ziss air stone(top, bottom, middle)? How tight do you twist the Ziss? thanks! Link to comment Share on other sites More sharing options...
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