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Pronunciation varies by accent · noun
The sludge that collects at the bottom (or walls) of an aquarium, consisting of fish excrement, decaying plant matter, and other assorted detritus.
The point is that the filter not only removes mulm from the tank but also ensures that this matter is very efficiently bathed in a constant flow of water, which will dissolve out anything that can be dissolved.
Use mulm when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Mulm means The sludge that collects at the bottom (or walls) of an aquarium, consisting of fish excrement, decaying plant matter, and other assorted detritus.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The point is that the filter not only removes mulm from the tank but also ensures that this matter is very efficiently bathed in a constant flow of water, which will dissolve out anything that can be dissolved.
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