Usually means: Decomposed organic debris in aquariums.
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We found 5 dictionaries that define the word mulm:

General (4 matching dictionaries)
  1. mulm: Merriam-Webster
  2. mulm: Wiktionary
  3. MULM: Wikipedia, the Free Encyclopedia
  4. mulm: The Phrontistery - A Dictionary of Obscure Words

Science (1 matching dictionary)
  1. Fishkeeping glossary (No longer online)

Definitions from Wiktionary (mulm)

noun:  The sludge that collects at the bottom (or walls) of an aquarium, consisting of fish excrement, decaying plant matter, and other assorted detritus

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