How To Remove Duckweed From Aquariums In 2023

Cleaning duckweed out of aquarium YouTube
Cleaning duckweed out of aquarium YouTube from


Duckweed is a floating aquatic plant that can be found in many aquariums and ponds. It is a fast-growing plant that can quickly take over an area, blocking light and leaving no room for other aquatic life. While Duckweed can be beneficial to an aquarium in certain cases, it's important to know how to remove it when it becomes a problem.

Types of Duckweed

There are several different varieties of Duckweed, which can be identified by their shape, size, and color. The most common type is Lemna minor, which is a small, round, green plant. Other types of Duckweed include Spirodela polyrhiza, which is larger and shaped like a star, and Wolffia arrhiza, which is the smallest type of Duckweed and is shaped like a drop of water.

Benefits of Duckweed

Duckweed is beneficial to aquariums in many ways. It can help filter out nitrates and other toxins, providing a healthier environment for fish and other aquatic life. Duckweed also provides a natural food source for some species of fish, as well as a cover for fish during spawning season. And because it is so fast-growing and prolific, Duckweed can help shade the aquarium, reducing algae growth and keeping the aquarium cooler.

When to Remove Duckweed

While Duckweed can be beneficial, it is important to know when to remove it. If Duckweed begins to take over the aquarium, it can block light and prevent other aquatic life from thriving. It can also trap debris, which can lead to an accumulation of toxins in the water. If Duckweed begins to accumulate in large quantities, it is time to remove it.

Manual Removal

The simplest method for removing Duckweed is to manually remove it from the aquarium. This can be done with a net or with your hands. When removing Duckweed with a net, be sure to get as much of the roots as possible. If you are removing it with your hands, be sure to wear gloves, as Duckweed can be slimy and slippery.

Chemical Removal

If manual removal is not an option, chemical removal is another option. There are several chemicals that can be used to kill Duckweed, such as copper sulfate and potassium permanganate. These chemicals should be used with caution, however, as they can also kill other aquatic life. Also, be sure to only use the recommended dosage, as too much can be harmful.

Preventing Duckweed Growth

Once Duckweed has been removed from the aquarium, it is important to take steps to prevent it from growing back. The most important step is to reduce the amount of nutrients in the water, as this is what Duckweed needs to grow. This can be done by performing regular water changes and tests, as well as limiting the amount of food that is given to the fish.


Duckweed can be beneficial to an aquarium, but it can also become a problem if it is allowed to take over. Knowing how to remove Duckweed and prevent it from growing back is an important part of maintaining a healthy aquarium. By following the steps outlined above, you can keep your aquarium clear of Duckweed and ensure a happy and healthy environment for your fish.

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