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Water Parameter
Unit(s): ppm
Target: 0 ppm
Danger: > 10 ppm
Tendancy: Increase
Increased: Metabolism
Decreased: Anoxic metabolism
Testing: Monthly
Maintenence: Water changes

Deep sand bed Nitrate reactor

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Water Changes

The simplest way is through water changes. Regularly changing a significantly large proportion of the water in a marine aquarium can reduce the concentration of nitrate through dilution, keeping nitrate at acceptable levels. The required amount of water to be changed, and the frequency of the changes, will depend on the how much nitrate is being produced, and how much needs to be removed. A lightly stocked, lightly fed tank will naturally have lower nitrate levels than a highly stocked and/or overfed tank.


Removal of nitrate from the water by biological means is attained using two two basic processes; dissimilatory and assimilatory nitrate reduction. Dissimilatory nitrate reduction involves anaerobic bacteria using the nitrate for respiration, rather than oxygen. Assimilatory nitrate reduction involves the physical uptake of the nitrate by bacteria or algae. See denitrification for full details.