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2. Deep sand bed - Wikipedia

   en.wikipedia.org/wiki/Deep_sand_bed

   A deep sand bed is [1] a filtration method used in some saltwater aquariums and some freshwater aquariums. A deep sand bed, similar to the Berlin Method , is designed to cultivate anaerobic bacteria in the bottom layers of sand , converting nitrate to nitrogen gas to remove toxic nitrates.

3. Substrate (aquarium) - Wikipedia

   en.wikipedia.org/wiki/Substrate_(aquarium)

   For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]

4. Freshwater aquarium - Wikipedia

   en.wikipedia.org/wiki/Freshwater_aquarium

   For a tropical fish tank, maintaining a warm environmental temperature ranging between 75 and 86 °F (24 to 30 °C) enables different tropical fish to thrive at different temperatures. [2] Aquarium substrate usually consists of sand or gravel. Aquarium substrate is important for the fish's health and replicating their natural environment.

5. Live sand - Wikipedia

   en.wikipedia.org/wiki/Live_sand

   Live sand, a term used in aquarism, is natural reef coral sand populated with millions of beneficial bacteria and organisms which aid in the dissolving of organic wastes like ammonia, nitrites and nitrates produced by larger organisms in saltwater aquariums. Live sand can be purchased from aquarium stores, but most hobbyists make their own by ...

6. 32 best aquarium pets that aren't fish - AOL

   www.aol.com/32-best-aquarium-pets-arent...

   Filled with live plants, substrates, and glimmering schools of fish, a perfectly curated aquarium is an awe-inspiring art form. But the best aquarium pets that aren’t fish prove that our finned ...

7. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   Greater flow rate of water through the gravel can be achieved via the use of water pump rather than air displacement. [1] Beneficial bacteria colonize the gravel bed and provide biological filtration, using the substrate of the aquarium itself as a biological filter. [9] [14] Undergravel filters can be detrimental to the health of aquatic ...