why do I have ammonia NH3?
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[MISSING: System.API.no-headers]All aquarium livestock produces ammonia, how much build up depends on how many animals are kept and how much you feed versus how efficient your filters are. This is why it is so important to slowly introduce livestock over many months to your aquarium allowing avoiding new tank syndrome ; it allows the biological filter bacteria to breed that consume the harmful ammonia as it is produced.
Leading causes of ammonia issues are listed here.
When too many fish are introduced or too much food is added to a new aquarium it cause free ammonia to rise. If allowed to rise too far the ammonia will reach toxic levels and kill the fish. This is often referred to new tank syndrome the following page will help to understand how to reduce and remove ammonia.