Nitrogen Cycle 5/14

In the nitrogen cycle, fish eat plants and dispose of it as waste which is turned into decaying organic matter and then into nitrate, nitrite, and ammonia. Bacteria eat the nitrite, nitrate, and ammonia and turn it into nitrogen in the atmosphere. I don't think it is possible to have a functioning ecosystem without any of these, especially the bacteria that take the nitrate, nitrite, and ammonia and put it back into the atmosphere for the cycle to start all over again. Each member in the cycle is vital to it being steady, so there is no way it is possible to have a stable environment without any of them.