How To Grow and Care for Guppy Grass?

Najas indica

Guppy grass is not just for guppies.

It’s a versatile and easy-to-grow aquatic plant that can transform your aquarium into a lush and lively environment.

You may have heard of guppy grass before, but do you know how to grow and care for it properly?

In this article, you will learn everything you need to know about guppy grass, from its optimal conditions and propagation methods to its growth rate and potential problems.

Guppy grass can be a great addition to your tank, whether you are a beginner or an expert aquarist. Read on to find out why.

What Is Guppy Grass?

Guppy grass, also known as Najas guadalupensis, is a freshwater plant that belongs to the water nymph family.

It is native to North and South America and grows in ponds, lakes, rivers, and streams.

The grass has thin, flexible stems reaching up to 3 feet (90 cm) long. Small, narrow leaves grow in opposite pairs along the stems.

Guppy grass produces tiny flowers and seeds that help it spread and reproduce.

Guppy grass is a fast-growing and adaptable plant that can thrive in various water conditions.

Depending on your preference and tank setup, it can grow rooted or floating.

Depending on their appearance and growth pattern, you can choose from different types of guppy grass.

Some of the most common ones are the following:

  • Common guppy grass: This is the most widely available type. It has bright green leaves and stems that grow densely and evenly.
  • Curly guppy grass: This type of guppy grass has curly leaves that give it a unique and attractive look. It grows slower than common guppy grass but can fill your tank quickly.
  • Red guppy grass: Red guppy has reddish-brown leaves and stems that add color and contrast to your aquarium. It grows faster than curly guppy grass but slower than common guppy grass.
Guppy Grass: A Superfood for You and Your Fish

Guppy grass is edible for humans and rich in protein, vitamins, minerals, and antioxidants. You can eat it raw or cooked or make it into tea or juice.

Some people even use guppy grass as an herbal remedy for various ailments like inflammation, diabetes, or kidney stones.

How To Grow Guppy Grass Aquarium?

Guppy grass is a versatile plant that can fit in almost any aquarium.

However, there are some things you need to consider before adding guppy grass to your tank.

Here are some tips on how to set up your guppy grass aquarium.

Aquarium Size and Conditions

Guppy grass can grow in any aquarium size, from nano tanks to large ones.

However, you must ensure your tank has enough space for guppy grass to grow and spread.

You must also provide good water circulation and filtration to keep your water clean and oxygenated.

Guppy grass can tolerate many water parameters but prefers slightly acidic to neutral water (pH 6.0-7.5) and moderate hardness (dGH 4-12).

Lighting Requirements

Guppy grass can grow under low to high lighting levels but grows faster and denser under medium to high lighting.

You can use any type of aquarium light, such as LED, fluorescent, or incandescent, as long as it provides enough intensity and duration for guppy grass.

You can also use natural sunlight, but be careful not to expose your tank to direct sunlight or excessive heat.

Water and Nutrient Requirements

Guppy grass is not a demanding plant regarding water and nutrient requirements.

It can get most of its nutrients from the fish waste and the water column.

However, you can supplement your guppy grass with liquid fertilizers or root tabs to boost its growth and health.

You can also add some CO2 to your tank, but it is unnecessary for guppy grass.

Adding Guppy Grass To Your Aquarium

You can add guppy grass to your aquarium in two ways: rooted or floating.

Method #1: Rooted Guppy Grass

If you want to plant guppy grass in your substrate, use a fine-grained or sandy substrate that allows the roots to penetrate easily.

You can also use gravel or rocks, but you need to anchor the stems with some weights or clips.

Depending on your preference and tank design, you can plant guppy grass in bunches or individually.

Method #2: Floating

To float guppy grass in your water column, you just need to place the stems on the water’s surface and let them float freely.

You can also attach them to some driftwood or decorations to create structure and depth in your tank.

How Fast Does Guppy Grass Grow?

Najas indica
Source: Wikimedia

Guppy grass is one of the fastest-growing aquatic plants in the hobby. It can grow up to 2 inches (5 cm) per day, depending on the conditions.

Guppy grass can outgrow them easily compared to other plants, such as Java moss or Anubis. 

The growth speed of guppy grass depends on several factors, such as nutrients, CO2, water flow, lighting, and temperature.

The more favorable the conditions are, the faster guppy grass will grow.

However, fast growth can also be problematic if you don’t control it. Guppy grass can quickly take over your tank and crowd out other plants and fish.

To prevent this, you must regularly prune and trim your guppy grass. You can also reduce the lighting or nutrient levels to slow its growth.

How To Care for Guppy Grass?

Guppy grass is easy to care for, but you can do some things to make it happier.

Here are some tips.

Watering and Fertilization

Guppy grass does not need any special watering or fertilization. It can get most of its water and nutrients from the fish waste and the water column.

However, you can supplement with liquid fertilizers or root tabs to boost its growth and health.

You can also add some CO2 to your tank, but it is unnecessary for guppy grass.

Trimming and Pruning

Guppy grass grows fast and can crowd your tank.

You should cut off any extra or unwanted parts every month or more.

You can use the trimmed guppy grass to propagate new plants, give them away, or sell them to other hobbyists.

Dealing With Pests and Diseases

Guppy grass is tough but can get sick or infested by snails, aphids, fungi, or rot.

To avoid these problems, keep your water clean and oxygenated, quarantine new plants or fish, and remove and treat any affected parts.

Preventing Algae Growth

Algae can grow on guppy grass and slow it down.

To stop algae growth, balance your lighting and nutrient levels, and don’t overfeed or overstock your tank.

You can also add some algae-eaters like shrimp, snails, or otos or remove algae manually with a toothbrush or tweezers.

Troubleshooting Common Problems

Guppy grass is usually problem-free, but sometimes it can have some issues.

Here are some common problems and how to fix them: 

  • Yellowing leaves: This is from nutrient deficiency, low lighting, or poor water quality. Add some fertilizers, increase the lighting, or change the water to fix this.
  • Wilting or drooping stems: Your guppy grass may suffer from too much heat, light, or water flow. You can lower the temperature, reduce the lighting, or adjust the water flow to make it perk up again.
  • Overgrowth: This results from too much nutrients, CO2, or light. To fix this, reduce the fertilizers, CO2, or light. You can also prune and trim your guppy grass regularly.
  • Algae overgrowth: Algae growth is due to excess nutrients, light, or fish waste. You can reduce the fertilizers, light, or fish feeding to stop algae growth. You can also add some algae-eaters or remove algae manually to clean your guppy grass.


Now that you know how to grow and care for guppy grass, it’s time to bring some underwater magic to your aquarium.

With its unique appearance and easy maintenance, your fish will love it, and you’ll love watching them play.

And here’s a bonus tip: guppy grass is an excellent hiding spot for baby fish!

Keep an eye out for the little ones popping up among the leaves.

Happy planting!

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