How to Eliminate Brown Algae in a Salt Water Aquarium

Salt water aquariums contain a mixture of bacteria, some of which is necessary to keep the biological environment the same and keep the tank healthy, and others which need to be carefully removed. If your tank has excess nitrates and silicates in the water, it will start to grow brown algae, which can eventually cover the tank. Removing this involves cleaning the tank well, and removing these chemicals from the water to prevent regrowth.

Things You'll Need

  • Aquarium siphon
  • Aquarium brush
  • Distilled water
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Instructions

    • 1

      Siphon off as much of the brown algae as possible. Algae typically settle on plants, rocks, coral and glass, so check all aquarium decorations carefully.

    • 2

      Clean the aquarium glass using a brush. Ensure the brush cleans all over the glass, including close to the bottom of the aquarium and in any corners.

    • 3

      Siphon 30 percent of the aquarium's water into a bucket, and dispose of it.

    • 4

      Replace the 30 percent with distilled water, which should contain no nitrates.

    • 5

      Dissolve sea salts in to the water, checking the salinity frequently to ensure the desired level is reached. Ensure your sea salt is free from nitrates and silicates, or they could make the algae problem worse. Chemical-free salt is available from pet stores.

    • 6

      Siphon the substrate at the bottom of the aquarium after feeding, to remove excess food and dirt.

    • 7

      Increase the circulation of the tank. Turn your filter up if possible, or add air stones to areas which do not have a current. Brown algae is likely to grow in areas which are stagnant.

    • 8

      Reduce the time the aquarium light is on daily. The light should be on no more than eight hours a day.

    • 9

      Repeat cleaning every day for a week.