Why is my Hornwort shedding needles everywhere?

Needle shedding, commonly referred to as 'melting', is usually caused by a sudden, drastic change in water parameters, poor lighting, or the use of liquid carbon fertilisers (glutaraldehyde). Remove the dead debris and ensure stable conditions to encourage the healthy green tips to bounce back.

Can I plant Hornwort in the substrate?

Hornwort lacks true roots, so burying it deep in the substrate can cause the buried portion of the stem to rot. It is better left floating freely, or gently anchored near the bottom using a soft plant weight or wedged carefully between pieces of hardscape.

Does Hornwort need a heated aquarium?

No. Hornwort is incredibly versatile and can thrive in both coldwater setups and outdoor ponds, tolerating temperatures down to near freezing, just as well as standard tropical aquarium temperatures.

How do I propagate Hornwort?

Propagation is incredibly simple: just cut or snap a healthy stem into smaller pieces. Each individual fragment will continue to grow from the tip and quickly form a new, independent plant.

Is Hornwort safe for my shrimp tank?

Yes, it is highly beneficial for shrimp tanks. It readily absorbs excess nitrates and its fine structure provides a vast surface area for biofilm to grow, which shrimp love to graze on.

FreshwaterPlantsBeginner

Hornwort

Ceratophyllum demersum

Hornwort is a near-indestructible, fast-growing aquatic plant that excels at oxygenating water, competing with algae, and providing vital shelter for fish fry and invertebrates.

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Ideal Conditions

Temperature: 10 – 28 °C
pH range: 6 – 7.5
Hardness: 5 – 15 dGH
Adult size: 20 – 100 cm
Nano tanks upwards: 10 litres+
Lifespan: 1 – 5 years
Diet: photosynthesis
Water flow: low to moderate
Preferred setup: Can be floated or anchored, though it lacks true roots.

About the Hornwort

Ceratophyllum demersum, widely known as Hornwort, is a cosmopolitan aquatic plant found in still or slow-moving waters across the globe. Lacking true roots, it is exceptionally versatile and can be grown floating at the surface or loosely anchored to hardscape. Its rapid growth rate makes it a popular choice for absorbing excess nutrients, though it requires frequent pruning in smaller aquariums. The rigid, needle-like leaves offer exceptional hiding spaces for fry and small invertebrates.

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Is it right for your tank?

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Where Hornwort comes from

Native range

Cosmopolitan

Countries / regions

Global

Habitat

Slow-moving or still waters, including lakes, ponds, marshes, and quiet streams worldwide.

Found naturally on every continent except Antarctica.

Similar species

Green Cabomba
Cabomba caroliniana
Eurasian Watermilfoil
Myriophyllum spicatum
Anacharis
Egeria densa
Dwarf Ambulia
Limnophila sessiliflora

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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Cherry Shrimp
Neocaridina davidi
Shrimp love grazing on the biofilm that accumulates on Hornwort's dense, needle-like leaves.
Great
Guppy
Poecilia reticulata
The dense floating masses provide excellent hiding places for livebearer fry to escape predation.
Great
Betta
Betta splendens
Bettas enjoy resting near the surface on the floating foliage and building bubble nests among the stems.
Great
Goldfish
Carassius auratus
Goldfish often nibble on or uproot aquatic plants, though Hornwort's bristly texture and rapid growth rate sometimes allow it to survive.
Compatible with caution
Silver Dollar
Metynnis argenteus
Silver Dollars are voracious plant-eaters and will rapidly consume Hornwort.
Not recommended
Crayfish
Cherax spp.
Crayfish are destructive to most live plants and will easily snip the stems of Hornwort to pieces.
Not recommended

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