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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]
Marine clay is a particle of soil that is dedicated to a particle size class, this is usually associated with USDA's classification with sand at 0.05mm, silt at 0.05-.002mm and clay being less than 0.002 mm in diameter.
Ultisol, commonly known as red clay soil, is one of twelve soil orders in the United States Department of Agriculture soil taxonomy. The word "Ultisol" is derived from "ultimate", because Ultisols were seen as the ultimate product of continuous weathering of minerals in a humid, temperate climate without new soil formation via glaciation .
The soil types present tend to relate to the local soil types and hydrology of the pool. Finer soils such as clay, silt, and muck are more common in perched situations, whereas pools which are more connected to the water table have more coarse soils like sand or gravel.
It prefers a sandy, well-drained soil. [2] Heavy, clay-based soil retains moisture in winter months, which can kill many species. However, because C. lanceolata is rhizomatous (having underground stems), it is well-adapted to withstand extremes in soil moisture (both wet and dry). Adding compost to heavy soil can improve drainage as can ...
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In soils, clay is a soil textural class and is defined in a physical sense as any mineral particle less than 2 μm (8 × 10 −5 in) in effective diameter. Many soil minerals, such as gypsum , carbonates, or quartz, are small enough to be classified as clay based on their physical size, but chemically they do not afford the same utility as do ...
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