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        Summary 
        
         
          
           | Description | 
           Diagram of the  nitrogen cycle in an  aquarium. Drawn in  Sodipodi by  Ilmari Karonen,  SVG original available at  . | 
          
          
           | Date | 
           20 October 2005 | 
          
          
           | Source | 
           Own work | 
          
          
           | Author | 
           Users  Eliashc,  Ilmari Karonen on  en.wikipedia | 
          
          
           Permission ( Reusing this file) | 
           
            
             
              | Public domainPublic domainfalsefalse | 
              
             
            
             
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              I, the copyright holder of this work, release this work into the  public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse 
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        中文:  Image:Aquarium Nitrogen Cycle(zh).png
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