Plant profile

Trichomanes Javanicum (Borneo Fern)

Trichomanes javanicum

Common names: Trichomanes Javanicum (Borneo Fern), Trichomanes javanicum

Hardscape, Paludarium, RipariumSlow

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Countries of origin

Good fit for your tank?

Good fit for

Humid paludariums, terrariums, and ripariums with wet roots and emersed fronds
Shrimp aquariums needing grazing surfaces or shelter
Hardscape-focused layouts with gentle circulation
Keepers willing to thin, clean, and inspect slow growth

Think carefully if

The aquarium is newly cycled or already struggling with algae
Debris regularly settles on plants and hardscape
Correct submerged, floating, or emersed placement is not available
Borneo Fern is an epiphytic wet-tropical fern, not a dependable permanently submerged aquarium plant. Full submersion commonly leads to gradual decline.

A small to medium moss, fern, liverwort, floating plant, or humid-enclosure plant with thin divided fern fronds with delicate translucent tissue. Best used for humid paludariums, terrariums, and ripariums with wet roots and emersed fronds; correct placement is essential.

Growth and Appearance

Usual appearance

This small to medium plant has thin divided fern fronds with delicate translucent tissue. Its usual colour is dark to medium green. Shape, density, and colour can vary with light, nutrients, flow, temperature, trimming, and the supplied specimen.

It is a humidity-loving terrestrial or epiphytic fern rather than a reliable submerged aquarium fern.

It is normally used for humid paludariums, terrariums, and ripariums with wet roots and emersed fronds. During the first few weeks, watch for firm growing tissue, new attachment points, roots, shoots, or fronds rather than expecting rapid coverage.

Requirements

Substrate: Use hardscape attachment for mosses and rhizome ferns, calm surface space for floating plants, and moist emersed substrate for terrestrial or humidity loving ferns. do not bury fern rhizomes.

Essentials

Start with low to medium light. Increase light only after healthy growth is established.
Keep the roots or base moist while the foliage remains above water in high humidity.
Keep temperature and water conditions stable rather than chasing one exact value.
Provide enough circulation to prevent debris buildup without tearing delicate tissue.
Use a complete fertiliser carefully when the aquarium does not already supply enough nutrients.
Use a stable terrarium, riparium, or paludarium rather than treating it as a permanently submerged aquarium plant.

Optional improvements

Stable injected CO₂ may improve submerged moss and fern growth where recommended.
Regular gentle cleaning can prevent debris from smothering fine moss or liverwort tissue.
A mature aquarium usually reduces the risk of early algae covering slow plants.

Beginner setup checklist

Cycled, filtered aquarium or suitable humid enclosure
Low or moderate light
Correct submerged, floating, or emersed placement
Gentle water movement
Consistent fertilising where needed
Clean scissors and tweezers
No buried rhizome or crown

CO₂ guidance

Injected CO₂ is unnecessary. This plant obtains carbon from air at the surface or is better grown emersed. Aquarium CO₂ injection does not correct unsuitable placement.

CO₂ should remain stable and be balanced with light, nutrients, circulation, and oxygen. Do not increase light sharply simply because CO₂ is present.

For floating and emersed plants, access to atmospheric CO₂ means surface condition, humidity, and correct placement are more important than injection.

Planting and Care

Growth rate: Slow
Growth form: Emersed, Epiphyte, Fern
Rooting type: Epiphyte, Rooted
Propagation: Division, Spores
Emersed growth: Yes

Preparation

Remove the pot and rock wool, then rinse the roots.
Remove fully soft, broken, or decayed tissue.

Recommended placement

Plant the roots in wet substrate or attach the base to constantly moist hardscape.
Keep the leaves or fronds above water in humid air.
Do not treat temporary survival underwater as proof of long-term submerged suitability.

Emersed attachment

Secure the roots or base to wet wood, porous stone, or moist substrate.
Use soft thread or a small amount of plant-safe glue on non-growing root tissue when necessary.
Keep the foliage above water and maintain high humidity.

Trimming

Remove damaged leaves or fronds close to the stem or crown.
Use clean scissors and avoid removing most healthy foliage at once.
Stem cuttings may be rooted emersed where appropriate.

Propagation by emersed cuttings or division

Select a healthy rooted division or stem cutting.
Place it in moist substrate or on wet hardscape in high humidity.
Keep the leaves or fronds above water.
Do not propagate from tissue that is already rotting underwater.

Propagate only healthy growth. Allow weak, newly imported, or melting plants to recover first.

Normal adjustment

Transport, handling, and a change from nursery conditions can temporarily slow growth or damage older tissue.

Normal signs include firm rhizomes or growing tissue, new roots, small shoots, plantlets, or slowly developing fronds.
Fronds may remain intact underwater for a while even when the plant is gradually declining. Judge success from new growth.
Colour and form may change after several weeks underwater or emersed.

Signs needing attention

Soft spreading decay, a dark mushy rhizome, repeated loss of every new shoot, or a foul-smelling mat.
Algae and debris covering most new growth.
Floating plants repeatedly sinking or becoming waterlogged.
Emersed plants losing all leaves because humidity or root moisture is too low.

Borneo Fern is an epiphytic wet-tropical fern, not a dependable permanently submerged aquarium plant. Full submersion commonly leads to gradual decline.

Suitability and Problems

Shrimp suitability: Not submerged
Goldfish resistance: Low
Fish damage risk: Moderate
Melt risk: High
Algae susceptibility: Moderate high

Common problems

Plant turns brown or transparent: Adaptation, excessive heat, trapped debris, unsuitable submersion, physical damage, or unstable conditions may be involved.
Algae covers moss or fern leaves: Slow growth, excessive light, unstable CO₂, trapped waste, or weak circulation may contribute.
Moss, liverwort, or fern portion detaches: The attachment may be weak, the clump may be too thick, or fish and maintenance work may be disturbing it.
Little or no visible growth: Slow growth can be normal. Low nutrients, unsuitable temperature, unstable CO₂, repeated disturbance, or incorrect placement can also delay growth.
Floating leaves become wet, sink, or decay: Strong surface flow, splashing, condensation, overcrowding, or transport damage may be involved.
Every new submerged leaf or frond declines: The plant may not be adapted to permanent submersion.

Do not diagnose from appearance alone

Yellowing, holes, pale growth, browning, slow growth, or weak fronds can result from several causes. Possible causes include light, CO₂, fertilising, temperature, debris, poor circulation, adaptation, physical damage, or unsuitable submerged placement.

Safe checking order

Review recent water, temperature, lighting, and equipment changes.
Compare symptoms on new growth with symptoms on old growth.
Inspect the rhizome, crown, attachment point, or underside of the mat for decay.
Check whether debris or algae is blocking light and circulation.
Review fertilising and CO₂ consistency where applicable.
Confirm that floating leaves stay dry and emersed plants remain humid.
Change one variable at a time and judge improvement from new growth.

Old damaged tissue will not repair itself. Remove only material that is fully decayed or no longer useful.

Who this plant suits

Beginner tanks: Better for experienced keepers because permanent submersion or botanical identity is uncertain.
Shrimp tanks: usually suitable after rinsing and quarantine, with fine growth providing grazing and shelter.
Low-tech tanks: many mosses and Java Fern forms grow without injected CO₂, though growth may be slow.
High-tech tanks: stable CO₂ can improve density and recovery but may also increase trimming needs.
Nano aquariums: suitable for miniature forms when they are trimmed and kept free of debris.
Community aquariums: suitable with fish that do not uproot, shred, or repeatedly cover the plant with waste.

Important limitations

Goldfish and plant-eating fish may pull apart moss, eat floating plants, or damage soft fronds.
Dense moss and fern clumps collect debris and can develop algae when circulation is weak.
Floating plants can block light and gas exchange when not thinned.
Borneo Fern is an epiphytic wet-tropical fern, not a dependable permanently submerged aquarium plant. Full submersion commonly leads to gradual decline.

Plant Decision Guide

Choose it for humid paludariums, terrariums, and ripariums with wet roots and emersed fronds.
Choose a low-tech approach when slow growth and regular cleaning are acceptable.
Choose a CO₂-assisted approach when denser moss or faster fern recovery is important and the system can remain stable.
Think carefully if the aquarium is new, algae-prone, very warm, or heavily stocked.
Think carefully if loose fragments could enter filters or spread to unwanted areas.
Check local regulations before keeping or disposing of floating plants.
Inspect the actual specimen because moss and fern trade names are not always used consistently.

Identification and Origin

Accepted name: Trichomanes javanicum
Genus: Trichomanes
Species epithet: javanicum
Family: Hymenophyllaceae
Origin: Asia, Bangladesh, Brunei, China, India, Indonesia, Malaysia, Myanmar, Singapore, Taiwan, Thailand, Timor-Leste, Vietnam

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