How to Add Salt to a Freshwater Tank

Adding salt to your freshwater tank will give the fish an environment that is closer to what they need in order to be healthy and thrive. Many tap-water sources do not contain enough dissolved salts. A little bit of salt acts as a sort of tonic for freshwater fish.

Things You'll Need

  • Aquarium salt or salt with no additives
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Instructions

    • 1

      Change the water of your tank using tap water that is as close to the temperature of the tank as possible.

    • 2

      Add one tablespoon of salt for every five gallons of water. The salt should be free of any additives like iodine or potassium. You can use salt that is made just for aquariums, which is sold at pet stores.

    • 3

      Return the fish to the tank once the temperature has settled; avoid shocking your fish by changing their environment drastically.