A. The nitrogen cycle of a saltwater aquarium is a chain reaction in nature resulting in the birth of various types of nitrifying bacteria, each with their own job to do. Each new bacteria born consumes the the byproduct of the previous one, and in turn gives birth to the next bacteria.
The biological filter is the heart of every saltwater aquarium. Without a strong, healthy biological filter, a tank will never be able to support a healthy population of fish and invertebrates.
What is the Nitrogen Cycling Process? explains how the bacteria in a biological filter consumes the toxic ammonia created in an aquarium, leaving relatively nontoxic nitrates in their place.
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