Evan Posted May 1 Share Posted May 1 Hi all. I hope someone can answer my questions. I have a sand substrate maybe 2 or 2 1/2 inches deep. Recently, after 3 years, bubbles have started coming out of the sand. I assume this is a result of anaerobic bacterial activity within the substrate. Is this harmful to the fish? If it is, what are my options? Thanks! Link to comment Share on other sites More sharing options...
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