Daniel Posted September 1, 2020 Share Posted September 1, 2020 (edited) I have always assumed mulm was some sort of combination of living and dead bacteria. I was always happy to see it because I assumed the mulm is processing fish waste from something more toxic to something less toxic. But that is a least 2 assumptions so far. I haven't googled this yet so I am throwing the question out to the forum. What is mulm? Edited September 1, 2020 by Daniel 2 Link to comment Share on other sites More sharing options...
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