Chain Sword

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About Chain Sword

Chain Sword is a popular freshwater aquarium plant known for its slender grass-like leaves and spreading runners. Given suitable conditions, it can form a dense green foreground carpet while adding a natural grassy texture to planted aquariums.

Unlike some more demanding carpeting plants, Chain Sword is relatively adaptable and can grow successfully in a range of setups. Good lighting, nutrient-rich substrate and CO₂ will encourage faster spreading and a denser carpet.

It is particularly effective when planted around rocks and driftwood, where its runners can gradually fill open areas and create a natural transition between hardscape and substrate.

Quick Care Guide

Scientific Name: Helanthium tenellum
Common Name: Chain Sword / Pygmy Chain Sword
Family: Alismataceae
Type: Freshwater Aquarium Plant / Carpeting Plant
Growth Rate: Moderate
Difficulty: Easy to Intermediate
Placement: Foreground
Lighting: Moderate to High
CO₂: Recommended but not essential
pH: Approximately 6.0–7.5
Temperature: Approximately 18–28°C
Water Hardness: Soft to Moderately Hard
Propagation: Runners / Plantlets
Growth Form: Low-Growing Grass

Frequently Asked Questions

Is Chain Sword easy to grow?

Yes. Helanthium tenellum is generally considered easy to intermediate and can adapt to a variety of freshwater aquarium conditions.

Does Chain Sword need CO₂?

No, but CO₂ is beneficial. It can improve growth rate and encourage a denser, more compact carpet.

How does Chain Sword spread?

It spreads naturally through horizontal runners, producing new plantlets that gradually expand across the substrate.

How do I get Chain Sword to carpet?

Plant individual portions with some space between them and provide good lighting, suitable nutrients and stable conditions. The runners will gradually fill the gaps.

What substrate is best for Chain Sword?

A nutrient-rich planted aquarium substrate is ideal. Good root nutrition helps the plant establish and produce runners.

Common Mistakes

Planting large clumps too closely together
Separating the plant into smaller portions allows runners to spread more evenly.

Insufficient lighting
Low light can result in taller, thinner growth rather than a compact foreground.

Poor substrate nutrition
Good root nutrition helps Chain Sword establish and spread.

Planting the crown too deeply
Keep the growing point above the substrate to prevent rot.

Not giving it room to spread
Chain Sword can gradually expand through runners, so allow space for the carpet to develop.