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How to Kill Black String Aquarium Algae With Bleach

Black string algae, also known as black beard algae or just black algae, may resemble either black hair or a black carpet, depending on the amount of growth. The algae form on slow-growing plants, decorations and wood inside the aquarium. Bleach is an effective method for killing the algae. Prevent regrowth by using snails and fish that eat the algae along with an algaecide.

Things You'll Need

Bleach
Sink
Water
Soft-bristle brush
Algaecide

Instructions

- 1
  Remove all decorative items and rocks that have algae growing on them.
- 2
  Fill the sink or a tub with an equal amount of water and bleach. Place items in the solution for a few minutes or until the algae turn white, indicating the algae are dead.
- 3
  Scrub items with a soft-bristled brush to remove all algae, then place them back into the aquarium.
- 4
  Add algaecide to the aquarium water according to instructions on the bottle. Algaecide can be found at pet and fish supply stores.
- 5
  Reduce the amount of light to six hours a day to discourage algae growth.

Animals & Science