2010-05-23 淡水魚と海水魚 http://www.google.co.jp/search?sourceid=chrome&ie=UTF-8&q=%E6%B7%A1%E6%B0%B4%E9%AD%9A%E3%80%80%E6%B5%B7%E6%B0%B4%E9%AD%9A+%E5%B2%A1%E5%B1%B1%E7%90%86%E7%A7%91%E5%A4%A7%E5%AD%A6好適環境水::http://kakenet.net/spec/spec7.html