Can I plant Guppy Grass in the substrate?

Yes, you can gently push the stems into the substrate, though it lacks a true, deep root system and primarily uses the substrate merely for anchorage. It grows equally well, if not better, when left floating.

Why is my Guppy Grass breaking apart so easily?

The stems of Najas guadalupensis are naturally brittle. This is an evolutionary adaptation that allows it to easily reproduce and spread via fragmentation. You can simply leave the broken pieces in the tank to grow into new plants.

Does Guppy Grass need added CO2 to survive?

No, it is a classic low-tech plant that thrives entirely without supplemental carbon dioxide. It is highly adaptable to standard aquarium conditions.

Will Guppy Grass take over my aquarium?

Because it is a very fast grower, it can form dense mats that block out light to lower areas quickly. Regular trimming and removal of excess growth is required to keep it under control.

Is Guppy Grass good for shrimp tanks?

Absolutely. The dense foliage provides brilliant hiding spaces for vulnerable shrimplets, and the fine leaves offer a massive surface area for the biofilm that shrimp love to graze on.

FreshwaterPlantsBeginner

Guppy Grass

Najas guadalupensis

A highly adaptable, fast-growing stem plant famous for creating dense underwater thickets that serve as ideal nurseries for fry and shrimp.

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Ideal Conditions

Temperature: 15 – 30 °C
pH range: 6 – 8
Hardness: 2 – 15 dGH
Adult size: 30 – 90 cm
Min. volume: 10 litres+
Lifespan: 1 – 5 years
Diet: Photosynthetic

About the Guppy Grass

Najas guadalupensis, universally known as Guppy Grass, is a legendary plant among breeders and aquarists. Its delicate, highly branching stems create a dense, tangled network that serves as the perfect nursery for vulnerable fry and invertebrates. Extremely versatile, it thrives whether rooted loosely in the substrate or left to float freely at the surface. Its vigorous growth makes it an excellent choice for absorbing excess nutrients and outcompeting nuisance algae.

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Is it right for your tank?

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Where Guppy Grass comes from

Native range

North America, Central America, South America

Countries / regions

United States, Mexico, Colombia, Brazil

Habitat

Ponds, lakes, slow-moving rivers, and agricultural canals with stagnant or sluggish water.

Native across the Americas but has become naturalised and occasionally invasive in other parts of the world.

Similar species

Hornwort
Ceratophyllum demersum
Java Moss
Taxiphyllum barbieri
Waterweed
Elodea densa

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Guppy
Poecilia reticulata
The plant provides a dense, tangled thicket that serves as perfect cover for newborn fry to hide from hungry adults.
Great
Cherry Shrimp
Neocaridina davidi
Its dense foliage offers excellent shelter for shrimplets and creates a vast surface area for biofilm, which the shrimp graze on.
Great
Betta
Betta splendens
Bettas enjoy resting near the water surface and will readily use floating mats of Guppy Grass as natural hammocks.
Great
Silver Dollar
Metynnis argenteus
A voracious herbivore that will quickly consume the soft, delicate stems and leaves of the plant.
Not recommended
Florida Crayfish
Procambarus alleni
Large invertebrates will shred the brittle stems and uproot any planted portions while foraging.
Not recommended

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