BAT Posted January 30, 2022 Share Posted January 30, 2022 In one of my tanks I sometimes notice air bubbles coming up from the gravel. It’s not a steady stream of bubbles. Just a few here and there. Is it bacteria working in the gravel? Is it a problem? One time i noticed it right before a nitrate spike. BAT 1 Link to comment Share on other sites More sharing options...
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