Duckweed (Lemna Minor) for Sale | Floating Aquarium Plant

Duckweed Care Guide

Duckweed (Lemna minor) is one of the easiest floating aquarium plants to grow and is suitable for both beginners and experienced aquarists. It naturally floats on the water's surface and reproduces rapidly under favorable conditions.

Lighting

Duckweed grows well under low to moderate lighting and can tolerate high light levels. Strong lighting will typically encourage faster growth and more rapid surface coverage.

Water Parameters

• Temperature: 60–85°F

• pH: 6.0–8.0

• Hardness: Soft to Hard Water

• CO2: Not Required

Duckweed is highly adaptable and thrives in a wide range of freshwater aquarium conditions.

Fertilization

While Duckweed can survive in nutrient-poor aquariums, it grows best when nitrates and other nutrients are available in the water column. In heavily planted tanks with very low nutrients, occasional liquid fertilizer may help maintain healthy growth.

Maintenance

Duckweed is known for its extremely fast growth rate. Most aquarists will need to remove excess plants regularly to prevent complete surface coverage. Thinning the plant helps maintain gas exchange, allows light to reach submerged plants, and keeps the aquarium looking its best.

Best Uses

Duckweed is commonly used to:

• Reduce nitrates and excess nutrients

• Help control algae growth

• Create natural shade for fish and shrimp

• Provide cover for baby shrimp and fry

• Improve the natural appearance of freshwater aquariums

With minimal care requirements and excellent water-quality benefits, Duckweed remains one of the most popular floating plants for shrimp tanks, breeding aquariums, and planted freshwater setups.

Duckweed vs Amazon Frogbit vs Water Lettuce

Duckweed, Amazon Frogbit, and Water Lettuce are three of the most popular floating aquarium plants. While all help improve water quality and provide cover for shrimp and fish, they differ significantly in appearance, growth rate, and maintenance requirements.

For aquarists looking for the fastest-growing floating plant and maximum nutrient absorption, Duckweed is difficult to beat. If you prefer a more decorative floating plant with long dangling roots, Amazon Frogbit or Water Lettuce may be a better fit. Many shrimp keepers choose Duckweed because it provides excellent biofilm-grazing opportunities, natural shade, and rapid nitrate reduction with minimal care.

Real Owner Experience with Duckweed

At The Shrimp Farm, Duckweed is one of the floating plants we use most often in shrimp breeding and grow-out tanks. We like it because it grows quickly, helps absorb excess nutrients, and provides excellent cover for baby shrimp. It's also one of the easiest plants to keep alive, making it a great choice for beginners.

The biggest mistake we see hobbyists make is allowing Duckweed to completely cover the water surface. While the plant is excellent for nitrate removal and algae control, excessive growth can block light from reaching other aquarium plants. We recommend removing a handful during routine maintenance to keep growth under control.

For shrimp keepers, Duckweed offers an additional benefit that often goes unnoticed: its roots and undersides quickly develop biofilm that shrimp love to graze on. In our experience, shrimp are frequently found feeding among Duckweed roots throughout the day. If you're looking for an inexpensive floating plant that improves water quality, provides natural shade, and benefits shrimp, Duckweed is hard to beat.

Frequently Asked Questions About Duckweed

Is Duckweed a good aquarium plant?

Yes, Duckweed (Lemna minor) is one of the most popular floating aquarium plants because it grows quickly, helps remove excess nutrients, reduces algae growth, and provides cover for shrimp and fish.

Is Duckweed good for shrimp tanks?

Duckweed is excellent for shrimp tanks. Its roots provide surface area for biofilm growth, which shrimp naturally graze on. The plant also creates shaded areas that help shrimp feel secure and supports stable water quality by absorbing nitrates.

How fast does Duckweed grow?

Duckweed is one of the fastest-growing aquarium plants available. Under good lighting and nutrient-rich conditions, it can double its coverage in just a few days and may require regular thinning.

Does Duckweed help reduce nitrates?

Yes. Duckweed absorbs nitrates and other excess nutrients from the water column as it grows. Many aquarists use Duckweed as a natural method of nutrient export and algae control.

Does Duckweed need CO2?

No. Duckweed grows well without supplemental CO2 and is considered one of the easiest floating plants for beginners.

What lighting does Duckweed need?

Duckweed can grow under low, moderate, or high lighting. Moderate lighting typically produces healthy growth, while stronger lighting may encourage even faster reproduction.

Can Duckweed completely cover the surface of an aquarium?

Yes. Duckweed can rapidly spread across the entire water surface if left unmanaged. Most aquarists remove excess plants during maintenance to maintain gas exchange and allow light to reach submerged plants.

Is Duckweed safe for fish and shrimp?

Yes. Duckweed is safe for freshwater shrimp, community fish, and fry. Many fish species enjoy the shaded environment it creates, while shrimp benefit from the biofilm that develops on its roots.

Why is my Duckweed turning yellow?

Yellow Duckweed is usually caused by nutrient deficiencies, poor water quality, or excessive surface agitation. Maintaining stable water parameters and adequate nutrients can help keep Duckweed healthy and green.

Can Duckweed help control algae?

Duckweed can help reduce algae growth by absorbing excess nutrients and blocking some light from reaching algae below. While it is not a cure for algae problems, it is often an effective part of an overall algae-management strategy.

How do I remove excess Duckweed from my aquarium?

The easiest way to control Duckweed is by skimming excess plants from the surface during routine water changes. Because it grows quickly, regular thinning is usually necessary in healthy aquariums.

Where can I buy healthy Duckweed online?

The Shrimp Farm offers healthy, actively growing Duckweed that is carefully packed and shipped directly to your door. Duckweed is an excellent choice for shrimp tanks, breeding aquariums, and planted freshwater setups.