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Definition of Mulm
1. Noun. The sludge that collects at the bottom of an aquarium, consisting of fish excrement, decaying plant matter, and other assorted dreck. ¹
¹ Source: wiktionary.com
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1. Noun. The sludge that collects at the bottom of an aquarium, consisting of fish excrement, decaying plant matter, and other assorted dreck. ¹
¹ Source: wiktionary.com