Does Vallisneria need CO2?

No. Vallisneria grows in low-tech tanks without CO2 injection or liquid carbon supplementation.

What light does Vallisneria need?

Vallisneria is a medium-light plant. Most modern aquarium LEDs cover this. Anything sold as planted-tank-ready works. The stock hood on a basic shop tank usually does not.

Is Vallisneria safe for shrimp?

Yes. Vallisneria is safe in shrimp tanks. The usual quarantine still applies: any plant from a commercial nursery should be soaked and rinsed first to flush copper and pesticide residue.

Image: Wikimedia Commons — attribution available on this site.

Plant appearance can vary with lighting, nutrients, CO₂, and whether it is grown submerged or emersed.

easymedium lightNo CO2fast growthrosette

Vallisneria

Vallisneria spiralis

Also: Eelgrass, Tape Grass

Vallisneria is a classic tall background plant with ribbon-like leaves that sweep across the water surface. It tolerates hard, alkaline water well, making it one of the few plants suited to African cichlid tanks. Spreads quickly via runners.

Evidence: verifiedConfidence: high

Livestock warningVallisneria is at moderate-to-high risk from herbivores and fin-nippers — check your fish list before buying.

Care at a glance

Difficultyeasy

Lightmedium

CO2Not needed

FertiliserNot essential

Growth ratefast

Max height100cm

Placementbackground

Min tank40L

Water parameters

Temperature15–30°C

pH6.5–8.5

Shrimp safeYes

Herbivore riskmoderate

Propagationrunners

Beginner guidance

Do not bury the crown. Plant individual runners in sand or fine gravel. Fast-spreading: thin runners regularly to prevent them from overtaking the tank. Good option for alkaline tap water setups.

Cautions

Will fill the tank surface if not trimmed, block light to other plants.

Sources

Vallisneria spiralis. Wikipedia — Species overview: cosmopolitan distribution, ribbon-leaf growth, and pollination biology.
Vallisneria spiralis. Flowgrow — Aquarium care: high light, CO₂ optional, runner propagation, and alkalinity preferences.

Fish whose water overlaps

Peaceful freshwater species with overlapping temperature and pH — still run a pair check for the real mix.

Similar plants

Java Mosseasy · low light · no CO2
Anubiaseasy · low light · no CO2
Java Ferneasy · low light · no CO2
Amazon Swordeasy · medium light · no CO2
Hornworteasy · low light · no CO2
Water Wisteriaeasy · medium light · no CO2

Plan the tank around this plant

Set a 40L+ footprint, then verify livestock before you buy Vallisneria.

Open pair checker Tank builder

Tank hubs: 40L

Related plant guides

Easy beginner aquarium plantsPlants that grow without CO2Fast-growing aquarium plants

All plants 40L tank hub

Common questions about Vallisneria

Does Vallisneria need CO2?: No. Vallisneria grows in low-tech tanks without CO2 injection or liquid carbon supplementation.
What light does Vallisneria need?: Vallisneria is a medium-light plant. Most modern aquarium LEDs cover this. Anything sold as planted-tank-ready works. The stock hood on a basic shop tank usually does not.
Is Vallisneria beginner-friendly?: Vallisneria is rated easy for difficulty. Do not bury the crown. Plant individual runners in sand or fine gravel. Fast-spreading: thin runners regularly to prevent them from overtaking the tank. Good option for alkaline tap water setups.
Is Vallisneria safe for shrimp?: Yes. Vallisneria is safe in shrimp tanks. The usual quarantine still applies: any plant from a commercial nursery should be soaked and rinsed first to flush copper and pesticide residue.