How to Eliminate Brown Algae in a Salt Water Aquarium

Algae is not harmful to fish, but does negatively effect the biological balance of an aquarium, which can cause disease.

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

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.

Tips & Warnings

• If you have repetitive brown algae problems, you may be overfeeding the tank. Reduce the amount you feed daily, and ensure any left overs are removed as soon as possible after feeding.

• Check any products you use in the aquarium for nitrates and silicates. Avoid using anything containing these, as this will encourage algae growth.

References

• "Saltwater Aquarium Setup and Care"; David E Boruchowitz; 2006
• "Saltwater Aquarium Models: Recipes for Creating Beautiful Aquariums That Thrive"; John H. Tullock; 2006
• "The New Encyclopedia of the Saltwater Aquarium"; Greg Jennings; 2007