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Learn more »Duckweed is the perfect snack for goldfish and it is completely safe to grow and feed to your goldfish. Goldfish seem to love this green floating plant that is not only easy to grow but also very nutritious.
There are many aquatic plants that you can grow in a goldfish aquarium, but goldfish seem to enjoy the accessibility and texture of duckweed over other plants. If you would like to learn more about how safe duckweed is for goldfish and how you can quickly grow this floating plant in their aquariums, this article has all the answers you need!
Is Duckweed Safe for Goldfish To Eat?
Yes, duckweed is quite safe for goldfish to eat. The fast-growing plant forms a lush green carpet across the tank’s surface with flat, tiny green leaves and a short stem-like root that dangles below the water. It has no properties that make it poisonous to goldfish, and they generally have an easy time digesting the plant.
Duckweed can be viewed as grass growing at the surface of your goldfish aquarium, making it easy for goldfish to eat the small pieces. Since duckweed grows so fast, allowing it to float freely and grow in your goldfish tank will help keep it from growing out of control, especially in brightly lit environments.
Duckweed is rich in protein and fiber, which makes it a great addition to your goldfish’s diet. It’s suitable for goldfish prone to bloating (which can lead to swim bladder issues) since the nutritional content of duckweed can help goldfish pass their waste more efficiently.
Goldfish are omnivores, so vegetative matter forms part of a healthy goldfish diet. A goldfish’s diet should be varied and not only consist of commercial pellets or flakes. Supplementing your goldfish’s diet with a natural source of protein and fiber, such as duckweed, can keep your goldfish’s digestive systems healthy and functioning properly.
Many goldfish die as a result of improper feeding, diet, and/or portion sizes – which can be easily prevented by proper education.
That's why we recommend the best-selling book, The Truth About Goldfish, which covers everything about goldfish nutrition, tank maintenance, illnesses & more! Check it out on Amazon today.
Can You Grow Duckweed In A Goldfish Aquarium?
You can easily grow duckweed in a goldfish aquarium because it is beginner-friendly and easy to care for. It is considered invasive because it grows fast under the right conditions. Depending on your tank’s lighting conditions, you must ensure your duckweed population flourishes. This aquatic plant does not require fertilizers or CO2 to stay healthy—the only requirement is to ensure that you have a bright artificial light a few inches above the waterline for a minimum of 6 hours.

Here are a few of the benefits of growing duckweed in your goldfish aquarium:
Benefits of Growing Duckweed in Your Goldfish Aquarium
1. Better Water Conditions
Duckweed does a good job of removing waste products produced by goldfish in the water column. Goldfish are notorious for being messy fish that make a lot of waste, increasing the aquarium’s ammonia and nitrate levels. Duckweed helps by absorbing the nitrates from the water and using them as a nutrient to grow while keeping the water clean for your goldfish.

2. Provides Shade for Goldfish
Goldfish can sometimes become sensitive to bright artificial lights in the aquarium. These can cause them to become inactive and hide more frequently, as they may instinctively feel exposed and in danger from predators. Duckweed can act as a shade to block out the harshness of the light; however, it can cause issues for other live plants in the aquarium with higher lighting requirements.
Duckweed grows faster when it has access to more than 6 hours of bright light, so if you have a bright light shining down into your aquarium, you may notice that it grows more rapidly. It’s best to place a small barrier or a partition to provide a “shady” area in your tank and a bright area.
3. Prevents Duckweed From Overgrowing In An Aquarium
Since duckweed grows rapidly in the right conditions, allowing your goldfish to eat it will keep it from overpopulating your aquarium. Goldfish seem to enjoy grazing on this plant, and you do not have to worry about them eating all of it because it grows quicker, especially if you have the entire tank surface carpeted with duckweed.

Preparing Duckweed for Your Goldfish
Not much preparation goes into feeding your goldfish duckweed. If you grow a thick carpet of duckweed in your goldfish aquarium, they will naturally snack on it throughout the day. However, if you find that your goldfish are eating too much duckweed at a time, you can grow it in a separate body of water with a grow light, scoop duckweed from the surface, and place it into your goldfish aquarium every couple of days.
Conclusion
Duckweed is an inexpensive and healthy snack for goldfish to graze on. Unlike some marine plants, it’s relatively easy to grow in your aquarium. This versatile aquatic plant has many benefits for goldfish, and they generally love the healthy and nutritious snack!
Featured Image Credit: hvqui, Pixabay