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==Introduction==
==Introduction==
The nitrogenous cycle converts toxic nitrogenous waste into relatively non-toxic compounds and is carried out by a mixed population of bacteria present in the biological filter and in surface biofilms. Ammonia is oxidised first to nitrite then to nitrate.
The nitrogenous cycle converts toxic nitrogenous waste into relatively non-toxic compounds and is carried out by a mixed population of bacteria present in the biological filter and in surface biofilms. Ammonia is oxidised first to nitrite then to nitrate.
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[[Category:Toxicology]]
[[Category:Toxicology]]
[[Category:Fish Diseases]]
[[Category:Fish Diseases]]
[[Category:Expert Review - Exotics]]
[[Category:Expert Review - Exotics]]