How Do I Stop the Algae in My Tank?

Though there is no such thing as an algae-free tank, there are several factors which contribute to the unduly rapid bloom of algae in tanks. Overcrowding, poor water quality, overfeeding and the amount of light received can all contribute to fast algae growth. Treating these issues, as well as undertaking other methods of algae management, can reduce the problem algae poses.

Things You'll Need

  • Water thermometer
  • Ruler
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Instructions

    • 1

      Use the ruler to determine the area of the water surface in your tank in inches. As a rule of thumb, you should have 1 inch length of fish in your tank for every square inch of surface area at the top of the water. Following the guideline will keep your tank from being overcrowded; overcrowding is a common cause of persistent algae in tanks, because the great amount of fish in such a small space produces the waste materials which algae feed on faster than most filtration systems can extract it. Remove a few fish if necessary.

    • 2

      Observe the area which houses your tank. If it is near a window where it may be subject to direct sunlight, move the tank to a different location. Likewise, if there are artificial lights nearby or over your aquarium which are on for more than eight to 10 hours a day, install timers to turn them off for at least 12 hours a day or relocate your tank.

    • 3

      Check the temperature of your tank in the morning and afternoon, recording these temperatures over the course of a week. If you record any steep changes in temperature (which can occur due to seasonal temperature changes and indoor air conditioners or heaters), you may not have an algal bloom. Temperature changes can cause small currents in the tank to lift debris along the bottom of the tank into the upper layers of water. If you suspect this is the case, upgrade your filtration system and consider purchasing a cooling unit for your tank to keep temperatures consistent.

    • 4

      Consider introducing a cleaning organism to your tank. Some organisms, like blue-legged hermit crabs, snails and urchins are all known to devour algae and can help keep your water clear.