Hornwort – Ceratophyllum demersum
Hornwort – Ceratophyllum demersum
Hornwort (Ceratophyllum demersum) is a popular, hardy freshwater aquarium plant known for its fine, feathery green foliage and incredible versatility. It can be grown floating or loosely anchored in the substrate, making it suitable for a wide variety of aquarium setups, from community tanks to shrimp tanks and fry grow-out aquariums.
Fast-growing and beginner-friendly, Hornwort can help absorb excess nutrients from the water column while providing excellent cover for shrimp, fry, and small fish. Its soft, bushy growth adds a lush, natural look to freshwater aquariums and makes it a great choice for low-tech planted tanks.
Key Features
- Fast-growing and hardy freshwater aquarium plant
- Great for beginners and low-tech aquariums
- Can be floated or loosely anchored
- Helps absorb excess nutrients from the water column
- Provides excellent cover for fry, shrimp, and small fish
- No CO2 injection required
Plant Care Information
- Scientific Name: Ceratophyllum demersum
- Common Name: Hornwort
- Plant Type: Floating / bunch plant
- Placement: Floating, background, or loosely anchored
- Lighting: Low to high
- Temperature: 60–82°F
- pH: 6.0–7.8
- Growth Rate: Fast
- Care Level: Easy
- CO2: Not required
Tank Placement
Hornwort can be left floating at the surface or loosely anchored in the background of the aquarium. Floating Hornwort provides shade, surface cover, and hiding places for fry and shrimp.
If anchoring Hornwort, avoid burying the stems too deeply in the substrate. The buried portion can decay if it is packed too tightly or deprived of water flow.
Lighting, CO2 & Nutrients
Hornwort is an excellent low-tech aquarium plant and does not require CO2 injection. It can grow in low to high lighting, though stronger lighting and available nutrients may increase growth speed.
Because Hornwort grows quickly and feeds from the water column, it can help absorb excess nutrients. This can support better water quality as part of regular aquarium maintenance.
Trimming & Maintenance
Trim Hornwort regularly to prevent overgrowth and keep the aquarium looking clean. Healthy trimmed sections can be floated or repositioned in the aquarium.
Hornwort may shed some needles when adjusting to a new aquarium or after sudden changes in temperature, lighting, or water parameters. Stable conditions usually help reduce shedding and support healthier growth.
Best Uses in Aquariums
- Beginner planted aquariums
- Low-tech freshwater tanks
- Shrimp tanks and fry cover
- Breeding tanks and grow-out tanks
- Goldfish aquariums
- Floating plant cover and background growth
Frequently Asked Questions
Can Hornwort grow without CO2?
Yes. Hornwort grows very well in low-tech aquariums without CO2 injection.
Should Hornwort be planted in substrate?
Hornwort can be floated or loosely anchored, but it should not be buried deeply. Deeply buried stems may decay.
Does Hornwort help with algae control?
Hornwort can help absorb excess nutrients from the water column, which may help reduce algae growth when combined with proper lighting, water changes, and aquarium maintenance.
Is Hornwort safe for shrimp and fry?
Yes. Hornwort is safe for shrimp, snails, and peaceful freshwater fish. Its dense growth provides excellent cover and grazing areas.
Why is my Hornwort shedding needles?
Hornwort may shed when adjusting to a new tank or when water conditions change quickly. Stable temperature, lighting, and water parameters help reduce shedding.
Can Hornwort float?
Yes. Hornwort is commonly used as a floating plant and works well for shade, fry protection, and natural cover.
Available at Tropical Treasures Wyo
Hornwort is a great choice for aquarists looking for a hardy, fast-growing aquarium plant that can be floated or loosely anchored in freshwater tanks. Visit Tropical Treasures Wyo in Cheyenne, Wyoming, or shop online for live aquarium plants, freshwater fish, shrimp, and aquarium supplies.
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Growing well as a free floating plant. Great cover for fish.
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