The diagram below represents a student's aquarium. Ammonia, nitrates and nitrites, which are different nitrogen compounds, can be harmful to fish. Usually, these compounds are removing by changing some of the water each week. The student wants to keep the nitrogen in the aquarium at healthy levels for the fish without having to change the water all the time. Describe the best way to do this, citing examples from the diagram below. Fish Waste Nitrites Ammonia (NH.) (NO ) Nitrosomonas (bacteria) Fish and the fish food Nitrates (NO Nitrobacter (bacteria) Plants

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