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The creatures burrow and overturn the top two to three inches of sand in search of food, which causes water to circulate deeper in the sand than it would if the creatures were not present. Deep sand beds may be made of a variety of materials, but typically fine or "superfine" sand is used, with a grain size between 1 mm and 0.05 mm.
Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [1] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a suitable habitat for fish. [ 2 ]
BBA, however, tends to grow in dense patches of fine strands. It may be a symptom of high levels of nitrates, phosphates, or iron. [15] It is considered one of the more difficult species to remove, and the plants may uptake calcium from hard water which makes them unpalatable to algivores. [3] BBA may occur in both saltwater and freshwater ...
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Aquatic plants are used to give the freshwater aquarium a natural appearance, oxygenate the water, absorb ammonia, and provide habitat for fish, especially fry (babies) and for invertebrates. Some aquarium fish and invertebrates also eat live plants. Hobbyists use aquatic plants for aquascaping, of several aesthetic styles.
Another source of waste is uneaten food or plants and fish which have died. These waste products collect in the tanks and contaminate the water. As the degree of contamination rises, the risk to the health of the aquaria increases and removal of the contamination becomes critical. Filtration is a common method used for maintenance of healthy ...
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