How to Make Copper Safe for Aquariums

Copper is a heavy metal, much like iron, lead and zinc. While the dangers of lead are more highly publicized, all heavy metals can be dangerous to animals. Copper in levels as low as five parts per billion (ppb) can destroy a fish's sense of smell, according to Nathaniel Scholz of the Northwater Fisheries Science Center in Seattle, Washington. Too much copper in their systems leads to changes in behavior from sensory damage. While this is more important in wild fish than in aquarium fish, the well-being of aquarium inhabitants must be considered.

While useful as medicine up to 1/4 parts per million (ppm) for treatment of ich, a parasitic infection, copper is fatal to any invertebrates you want kept alive in your tank such as crabs, snails, corals and anemones. Some fish, such as koi, accumulate copper in their systems and can build up toxic levels, resulting in death. The best way to make copper safe for your aquarium is to monitor the levels in the water and adjust the chemistry as needed.

Things You'll Need

  • Copper test kit for aquarium water Water conditioner for removing heavy metals
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Instructions

    • 1

      Test the level of copper extant in your aquarium. You'll need to test regularly, as tap water and well water can both contain copper in levels unsafe for aquarium fish. Follow the instructions on the treatment package to reach medicinal levels of copper.

    • 2

      Maintain a treatment level (.15 - .25 ppm) of copper for the recommended length of time to destroy the parasites. For tanks with invertebrates, you will want a separate quarantine tank for copper treatment of the fish. The parasites will die out if left with no host fish for 28 days; at that point it is safe to return your fish to the aquarium.

    • 3

      After treatment, condition your water to remove heavy metals and use activated charcoal filtration to help clear the water.