Bleach to Decontaminate Aquarium Tanks

Aquariums need to be cleaned thoroughly before water is added and the habitat for aquatic life is created. Any foreign bacteria present in the tank before the water is added can cause fatal health problems and infections in delicate fish. Bleach can act as a safe decontaminant for a new or used aquarium.

  1. Methods

    • You must choose the correct method for decontaminating your aquarium to be sure that all the bacteria are eliminated. If you have a new aquarium, it needs to be washed to remove any bacteria or harsh chemicals it may have picked up during manufacture or transit. If your fish will be living in a used aquarium, petfish.net recommends you allow the tank to soak before washing it to be sure all bacteria are eliminated.

    Soaking

    • When soaking the aquarium, you should first rinse the tank of any foreign objects that may be stuck to the bottom or sides. Next, pour 2 cups of bleach into the aquarium before filling it the rest of the way with hot water. Allow the aquarium to soak for 30 minutes before dumping out the water and washing the tank clean.

    Washing

    • When washing the tank, use a clean sponge, hot water and a small amount of bleach. Fill up a bucket with 1 gallon hot water and 1/2 cup bleach. Get the sponge wet and lightly scrub the inside of the aquarium. After the entire aquarium has been scrubbed, thoroughly rinse the inside with warm water until you are satisfied that all the bleach has been removed.

    Drying

    • Use a clean towel to soak up any excess water in the aquarium before allowing it to air-dry in a clean environment. Allowing the aquarium to fully dry before adding the water for the fish habitat is imperative. Any excess bleach residue will evaporate with the water and become harmless to your fish. If unevaporated bleach is introduced to the water, it can cause a severe imbalance in the water's pH level, killing your fish.

    Warning

    • Never add bleach directly to an aquarium habitat. It will cause a severe imbalance in the water's pH level, killing any aquatic life.