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How to get Rid of
Aquarium Green Water
     

This page explains briefly what to do about algae growing in aquariums, fish bowls, and ponds. More importantly there is also information about why algae is growing in your fish's home.
 
"Your fish's home" might be an aquarium, a fish bowl, or a pond. The comments on this page apply to all three types of fish homes.

 
 
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Click here to hear a Special Interview on Pet Fish Talk about the EcoBio-Block Family of Products, which are very effective at keeping aquarium water clear.
 
     

1. A Short Answer
If the water in your fish's home is green, then algae is growing in the water, which shows that the water contains too much dissolved fish waste. You should change some of the water in your fish's home every day, until the water in your fish's home is clear again.

How much water should you change? Don't overreact and change too much water at one time. Change 20% of the water once each day until the green is gone, then change 20% of the water twice a week.

Don't change more than 20% of the water in one day, unless you have a catastrophe, and green algae is not a catastrophe. Click here for information about changing water in your fish's home.

 
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2. What is Algae?
Just below is an email from Dan. I had written that algae is a plant, but Dan explains that algae is not a plant.
 
 

Customer Comments

Hello:
 
Reading your column on algae and problems related with it based in a setting such as a fish tank you advise your readers that algae is a plant when in fact it is not, but merely sharing the same ancestor (phylogeny) that give rise to both plants an protists containing chlorophyll a.
 
This complex unicellular organism referred to as a protist in the eukaryotic kingdom does not have true roots or stems and therefore is not considered a plant.
 
Algae does range in different colours due to the mixture of pigments in the chloroplast and many scientific and common names of algae are based on these colours. Chlorophyta is best known as green algae existing in both the fresh and salt water domains.
 
Thank You.
Dan N.
 
 
 

Thank you Dan for your explanation. There are several types of algae, that grow in fish's homes. Some types of algae float and multiply in the water. Other types of algae grow on objects such as the rocks, ornaments, gravel, plants, and the sheets of glass or plastic in your fish's home.

All Algae is not Green. There is also black algae, brown algae, red algae, and several other color variations. Everything written on the this page about green algae applies to the other color varieties of algae too.

 
Pet Fish Talk a Podcast about keeping pet fish in aquariums, fish bowls, and ponds.  
Click here to hear a Special Interview with Dr. Tim Hovanec about One And Only - Nitrifying Bacteria, which can help keep aquarium water clear and odor free.
 
 

3. Why is Algae Growing in My Fish's Home?
Algae needs water, light, and nutrients. If your fish's home has too much algae, we know your water is getting lots of light and has lots of nutrients dissolved in it. Where did the nutrients come from? Fish eat food and produce waste that is an excellent nutrient for algae.

 
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4. How Do I Get Rid of the Algae?
There are four approaches to getting rid of algae. Get some fish to eat it, poison the algae with chemicals, reduce the amount of light, or starve the algae by reducing the amount of nutrients in the water.

Algae Eating Fish such as Plecostomus Catfish and Siamese Algae Eaters are both good aquarium fishes that will eat some types of algae. But they will usually not eat all the algae in an aquarium, and we don't have a fish available that will filter out the algae that grows in water and makes the water green. Most aquarists enjoy having one or both of these types of fish, but an algae eating fish usually won't solve an algae problem.

 
 

Customer Comments

 
Hello, I enjoy your site and everything it has. I have a question regarding plecostomus though, mine always hides in a conch shell that is in the bottom of my 75 gal. tank that I have Oscars in. He never comes out of his shell or eats the vast amount of algae that is building up on the glass, why is this?
 
Thank you for your help,
Adam W.
 
 
 
Reply. Hello Adam. First, seashells, such as conch shells, are not good for freshwater aquariums, because seashells dissolve in freshwater and slowly change the water chemistry. Perhaps your Pleco is bothered by the minerals that dissolve from the conch shell.

Plecostomus Catfish do not eat all types of algae, and you may have a type of algae that your Plecostomus does not like to eat. Do not depend on a Plecostomus Catfish or any other species of fish to solve your algae problem.

 
There are chemicals that will kill the algae, but these chemicals are risky to you, to your fish, and to the environment. It's also complicated and expensive to use these chemicals. So we don't recommend chemicals for reducing algae.

A better method is to reduce the amount of light and the amount of nutrients in the water.

Reduce the Amount of Light.
If you have a fish bowl, move it away from the source of light such as a sunny window.

If you have an aquarium, keep the light turned off as much as possible. If your aquarium is near a sunny window, move the aquarium. If the aquarium is difficult to move, cover the side of the aquarium that faces the sunny window with aluminum foil (sold in grocery stores for wrapping food).

 

If you have a pond, you may need to cover it with lath or a special netting several feet above the pond to block the sunlight. Both the lath and the netting for this purpose are sold at home improvement centers.

Putting a pond lily or other floating plants such as Water Hyacinths in your pond will also reduce the amount of light that gets to the water. But do not try to reduce the amount of light hitting your pond by putting a plastic cover directly on the water, because the pond needs to be exposed to air or the fish will soon use up all the oxygen in the water and may suffocate.

Reduce the Amount of Nutrients
in the water by changing some water every day. The most effective way to get rid of algae is to reduce the amount of nutrients in your water.

Algae must have nutrients to grow. Your fish have been eating food and producing fish waste that dissolves in the water to become nutrients for the algae. Start changing water in your fish's home every day until the water clears and the green algae is gone. By changing the water, you'll remove the nutrients from the water and starve the algae.

Don't get impatient and change too much water at one time, because that can shock and harm your fish. Change at most 20% of the water each day until the green is gone, then change 20% twice a week. Don't change more than 20% of the water in one day unless you have a catastrophe. Green algae is not a catastrophe. Click here for more advice about changing water.

Slowly over a period of days the algae will disappear. You can put the water from your fish's home on the plants in your yard, so you won't be wasting water. When the water in your fish's home clears and most of the algae is gone, you can go back to changing water twice a week instead of every day.

 
 
5. Summary
    Algae is a plant that can grow in your fish's home.
  Algae doesn't hurt fish.
  Algae grows best in water with too much fish waste.
  Too much fish waste can harm your fish.
  Algae is a reminder to do more partial water changes.
 
Take action. When you see algae, change 20% of the water each day to reduce the dissolved fish waste that's in the water.
 
Click here now to continue on to another web page that contains Customer Comments and our Replies about How to Get Rid of Algae.
 
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