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First video of our new series on aquarium cycling. In this first class we want you to learn in depth what aquarium cycling is, how the process works and who carries it out. No more mistakes, no more incomplete explanations and no more mess. Here we show in a very complete way this important process that is also part of the important nitrogen cycle that must be established in our aquariums. GLOSSARY: Nitrogen cycle: It is one of the essential biogeochemical cycles on the planet (along with the carbon, phosphorus and sulfur cycles) responsible for recycling all the nitrogen in the biosphere and making life possible in it. In our aquariums it is also vital for life within it. Ammonia: Nitrogenous inorganic molecule, in gaseous form and very toxic to aquarium fish. It is formed by the decomposition of nitrogenous organic matter (ammonification process). Nitrites: Toxic nitrogenous inorganic molecule from the oxidation of ammonia. Nitrates: Nitrogenous inorganic molecule from the oxidation of nitrite. It is the final product of the nitrification process. Heterotrophic bacteria: Those that need organic matter to feed and develop (e.g. humans are heterotrophic). Autotrophic bacteria: Those that need inorganic matter (minerals and nutrients such as nitrites, nitrates, CO2, etc.) for their development (e.g. plants are autotrophic). Nitrifying bacteria: They are mainly autotrophic bacteria that carry out a chemical process called nitrification. There are heterotrophic bacteria capable of carrying out nitrification in extreme conditions, but these are not strictly called "nitrifying" since it is not their main mechanism for obtaining energy. Denitrifying bacteria: They are bacteria (they can be autotrophic or heterotrophic) that carry out the reverse process of nitrification, denitrification, eliminating nitrate from the system. Diazotrophic bacteria: Bacteria capable of assimilating gaseous nitrogen from the atmosphere and fixing it in their organism. Nitrification: Stage of the nitrogen cycle where certain organisms oxidize ammonia to generate nitrites and subsequently oxidize the nitrites to generate nitrates. Normally this nitrification is the process known as "cycling", although it does not correspond to the entire nitrogen cycle. Denitrification: Stage of the nitrogen cycle where certain organisms reduce nitrate, converting it into gaseous nitrogen that leaves the system. Ammoniotelic: Organism that excretes ammonia through its urine (e.g., bony fish such as most ornamental aquarium fish and other invertebrates). Ureotelic: Organism that excretes urea through its urine (e.g., cartilaginous fish such as rays and sharks). Urea: Nitrogenous organic waste compound. Our websites: ➡https://www.icasa.com ➡https://www.tropicalcenter.es Social networks ➡Facebook: / icamascotas ➡Instagram: / icamascotas Forums: ➡https://www.coralesymarinos.com ➡https://www.wikiacuario.com ➡https://www.filtrohydra.com ➡https://www.icanews.es