How to Get Rid of Nitrates

A new aquarium must complete the nitrogen cycle before its water chemistry is stable and toxin-free. Ammonia, nitrites and nitrates rise to dangerous levels and can kill your fish during the first few weeks. This condition is known as new tank syndrome. Unestablished filters cannot biologically process all the tank waste until healthy bacteria colonizes the substrate and filter. The bacteria in an established aquarium digests excess fish waste and uneaten food so that ammonia, nitrite and nitrate levels do not escalate. Regular partial water changes and good general tank hygiene will keep all three chemicals low to prevent or cure new tank syndrome.

Things You'll Need

  • Bucket
  • Siphon
  • Fish net (optional)
  • Water dechlorinator
  • Floating thermometer
  • Beneficial bacteria solution
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Instructions

    • 1

      Siphon out approximately 30 percent of your aquarium water. If nitrates are dangerously high in the aquarium, remove half the water as an emergency measure.

    • 2

      Use a siphon or net to remove debris and uneaten fish food from your aquarium's gravel.

    • 3

      Mix tap water with dechlorinator in a bucket according to manufacturer instructions. Place a floating thermometer in the bucket and add warm or cold water until the water in the bucket is the same temperature as the water in your aquarium. Pour the new water into your tank. Continue replacing water until your aquarium's water level is back to normal.

    • 4

      Replace about a third of your tank water every four days to keep nitrate levels at a minimum.

    • 5

      Shorten the nitrogen cycle efficiently and safely with a commercial beneficial bacteria solution. Follow the manufacturer instructions that come with your particular solution.