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Fluval FX4 High Performance Aquarium Filter, Canister Filter for Aquariums up to 250 Gal., A214
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US Tropical Fish

What is Mulm or Detritus?

What is that brown or black dust-like substance on the floor of your aquarium? If you have a freshwater tropical fish tank, you will soon

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Fluval FX4 High Performance Aquarium Filter, Canister Filter for Aquariums up to 250 Gal., A214