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How to Destroy Algae in an Aquarium

Algae growth is a natural aspect of maintaining aquariums, but it can quickly run rampant and affect other plant life. It is also unattractive when covering the sides of the tank, and blocks your view of the fish.

Controlling the amount of light and the nutrients in the water are the most effective ways to combat algae. The more light and excess nutrients in your tank, the more algae you'll have. Your fish need light and nutrients to survive; be careful not to impact them when you're trying to get rid of the algae.

Instructions

- 1
  Limit the light in the aquarium so that it receives no more than eight hours a day; this may be the most effective method of combating algae. Move the aquarium away from any windows, and set your aquarium light on a timer. Monitor the fish to see if they seem to be affected by the reduced light, and increase light time to 10 hours a day if needed. Fish need at least six hour of light per day in order to manufacture vitamin D and maintain good health.
- 2
  Keep the aquarium clean by changing the water. Replace it with reverse osmosis water, or use a filter that removes phosphate. Having excessive phosphate, potassium and nitrate will feed algae and make it grow faster. You can control these nutrients by making sure you don't feed your fish any more food than they need; uneaten food will nourish algae. Remove dead fish immediately, as their decaying bodies will contribute to algae growth.
- 3
  Keep a small amount of algae in the tank. Algae is more likely to spring up and grow rapidly when there is no competition for nutrients. If you leave a little bit growing on rocks in your tank, that algae will consume any excess nutrients in the water. This makes new algae growth difficult.

Animals & Science