I just thought I would take some time to explain some of the methods that can be used to cycle a marine aquarium in a little more detail that what we currently have on our forum. The nitrogen cycle in a marine environment is similar to that of the nitrogen cycle in a fresh water environment. In both environments you have nitrifying bacteria that coverts ammonia into nitrites and nitrites into nitrates. While the nitrifying bacteria in a marine aquarium are different bacteria then the nitrifying bacteria in a fresh water tank, they do perform the same functions and essentially work the same. A marine nitrogen cycle has the addition of de nitrifying bacteria which converts nitrates into nitrogen gas. I will be making many comparisons between the fresh water and salt water cycling methods through this article in order to better illustrate some points better for people who are new to salt water aquariums.