Is Duckweed Good For Fish Tanks?

Duckweed (Ultimate Floating Aquarium Plant) DustinsFishtanks
Duckweed (Ultimate Floating Aquarium Plant) DustinsFishtanks from

Duckweed is a popular aquatic plant that has been gaining traction in fish tanks in recent years. But is duckweed good for fish tanks? In this article, we'll explore the benefits and drawbacks of duckweed and help you decide if it's right for your tank.

What Is Duckweed?

Duckweed, also known as Lemna minor, is a floating plant native to Australia, Asia, and parts of Europe. It's a low-maintenance aquatic plant that grows quickly, making it a popular choice for beginner aquarists. Duckweed is composed of spongy, green leaves and is covered in small, white flowers. It can reproduce quickly and can cover the surface of a body of water in just a few days.

Benefits of Duckweed

One of the main benefits of duckweed is that it's a great oxygenator. It absorbs carbon dioxide and releases oxygen into the water, which can help keep your fish healthy and happy. Duckweed also helps keep the water clean by filtering out excess nutrients, such as nitrates and phosphates, that can cause algae blooms. In addition, duckweed can provide shade for your fish, which can help them feel more secure and prevent them from getting sunburned.

Drawbacks of Duckweed

The biggest drawback of duckweed is that it can quickly become overwhelming. The plant can spread and cover the surface of a tank in just a few days, blocking out light and preventing other plants from growing. In addition, duckweed can starve your tank of oxygen and nutrients if it becomes too abundant, which can be harmful to your fish. Finally, duckweed can become a breeding ground for parasites and pests, such as snails and other invertebrates.

How To Control Duckweed

If you decide to add duckweed to your tank, it's important to keep it under control. The best way to do this is to manually remove any excess duckweed from the surface of the water. You can also add fish that feed on duckweed, such as goldfish or koi, to help keep the plant in check. Finally, you can add aquatic plants that compete with duckweed for nutrients and light, such as water lettuce or water hyacinth.


In conclusion, duckweed can be a great addition to your fish tank. It's a low-maintenance plant that can help keep the water clean and provide shade for your fish. However, it's important to keep the plant under control, as it can quickly become overwhelming. With the right care and maintenance, duckweed can be a beneficial addition to your tank.

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