✦ DIFFICULTY Easy

A forgiving choice for newer planted tanks.

☀ LIGHT Low

Around 8 hours is a useful starting point.

≈ CO₂ Optional

Injection is not normally necessary.

↗ GROWTH Slow

Low trimming needs.

PLANT OVERVIEW

About Narrow Leaf Java Fern

A Java Fern variety with long, very thin leaves.

Narrow Leaf Java Fern is the slimmer, more delicate-looking variant of a classic tank staple, with thin ribbon-like blades that give a softer, wispier texture than the standard broad leaf version. Like all java ferns it should never be buried in substrate, the rhizome needs to sit exposed on driftwood or rock where it'll anchor itself with root tendrils over time. It thrives in low to moderate light and barely asks for anything else, making it nearly impossible to kill even for people who forget to dose ferts. Slow growing but tough as nails, and algae-resistant enough to handle a beginner's learning curve.
Shrimp friendly Low-tech suitable High-tech suitable Fry cover
CARE PROFILE

What this plant needs.

The useful numbers and practical notes, grouped around how you actually keep the plant.

□
TANK FIT

Placement + size

Primary placementMidground
Typical height6–12 in
Typical width8 in
Suggested minimum tank10 gal
Suggested tank height14 in+
☀
LIGHT + CO₂

Energy demand

Ideal lightLow
Photoperiod range6–10 hr
Approx. PAR10–50
Injected CO₂Optional
CO₂ benefitLow
●
NUTRITION

Where it feeds

Root feedingVery Low
Water-column feedingModerate
Overall fertilizer demandLow
Iron demandLow
MicronutrientsLow
≈
WATER

Useful parameter range

Temperature68–82°F
pH6–7.5
GH2–15 dGH
KH1–12 dKH
PLANTING

How to plant it.

Substrate: Attach to hardscape
Hardscape: Can be attached to rock or wood.
Do not bury the rhizome. Keep the rhizome exposed to reduce the risk of rot.

Do not bury the rhizome.

GROWTH + PROPAGATION

What to expect after planting.

Propagation

Rhizome division

Acclimation

Easy to acclimate.

COMMON PROBLEMS

What usually goes wrong.

Black spots on older leaves.