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So, when cycling a tank, different bacterial populations convert ammonia to nitrite and nitrite to nitrate. In my planted tank, nitrate is then taken by the plants. But, what about in saltwater tank? I read that there are some bacteria that convert nitrate back to nitrogen gas, which will be released to the atmosphere. How do we know that these bacteria had established themselves? And is there a bacteria-in-a-bottle type of thing that contains this type of bacteria? How long would it take to establish this bacterial colony on dry rock?