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Nachricht: <blockquote data-quote="ganesh" data-source="post: 383208" data-attributes="member: 2215">Achtung. Angezeigt wird NH3 (Free Ammonia).»Free ammonia, NH3 is a toxic gas and is the number 1 killer of fish. NH3 should not be confused with non toxic ammonium NH4 . Traditional ammonia test kits look at NH4 and until now people have not been able to look at NH3 in the low levels that are toxic. Normally aquarium filters are designed to convert or remove NH3 & NH4 through biological activity or chemical absorption. Rarely tested for in mature aquariums NH3 is viewed as a ‘new tank’ issue; the reality is any aquarium can experience a  raise in toxic NH3 through; pH change, filter blockages, bacteria crashes (sometimes by unseen insecticides), chemicals additives, or even simple water changes. If you wouldn’t dream of keeping fish without a filter you should invest in making sure it’s working.«<a href="http://www.seneye.com/why.html#" target="_blank">http://www.seneye.com/why.html#</a></blockquote>