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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. Clean-up crew - Wikipedia

   en.wikipedia.org/wiki/Clean-up_crew

   The clean-up crew is the term that has been used by many aquarists and vendors since the late 1980s to refer to various small animals commonly sold for use in keeping the reef aquarium clear of pest algae, detritus and parasites. [1] Among the most popular have long been blue-legged hermit crabs, scarlet hermit crabs, emerald crabs and various ...

4. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   Simple DIY fluidized sand bed filter. The fluidized bed filter (FBF) is a biological reactor only. The principle is to direct water through a sand (or similar media) bed from below so that the sand becomes fluidized – behaves like a fluid. This mechanism is seen in liquefaction, quick sand, and industrial processes including municipal sewage ...

5. 32 types of saltwater fish for your aquarium - AOL

   www.aol.com/32-types-saltwater-fish-aquarium...

   A sand-sifting goby cleans the substrate through its gills, including getting rid of certain bacteria, and also grazes on algae. A peaceful fish that should be kept alongside similarly non ...

6. 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]

7. Seal's Curiosity Over Aquarium Worker Cleaning Habitat ... - AOL

   www.aol.com/seals-curiosity-over-aquarium-worker...

   Naturally, the aquarium worker was smiling, too, and she even wiped at the glass a few extra times just for the curious seal. She must love her job! Then again, any job working with animals can be ...