02-20-2012, 11:45 AM
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Some folks think that nitrosomonas bacteria (bacteria that oxidize ammonia) will die off without a contant supply of ammonia. Not so, they will merely become less active. You should stop adding ammonia temporarily and perform a water change to get nitrites down, but still available. Nitrites in high amounts are toxic to nitrobacter bacteria. Once you have nitrates, the cycle is complete and you can begin routine weekly water changes and either add a few drops of ammonia per day, or add fish!