Java Fern

Microsorum pteropus

Plantae›Tracheophyta›Magnoliopsida›Polypodiaceae

📍 Southeast Asia

Java fern is one of the most forgiving aquatic plants, thriving under low light without CO2 injection. It must be attached to hardscape rather than planted in substrate, as burying the rhizome will cause it to rot. New plantlets emerge from the edges of mature leaves, making propagation effortless.

Tank Mates

Amano Shrimp

Peaceful algae grazers that won't damage fern fronds and benefit from the plant's shelter

excellent

Red Cherry Shrimp

Small, non-destructive shrimp that graze on algae and biofilm without harming the plant

excellent

Otocinclus

Gentle algae-eating fish that won't uproot or damage the fern's delicate structure

excellent

Neon Tetra

Small, peaceful schooling fish that provide activity without disturbing the plant

good

Anubias Barteri

Excellent companion plant with similar care requirements and low-light tolerance

excellent

Dwarf Hairgrass

Foreground plant that complements Java fern's midground placement and creates layered aquascaping

good

Common Diseases

Rhizome Rot

Symptoms

Blackening or mushy rhizome, leaf yellowing, plant deterioration despite good water conditions

Treatment

Ensure rhizome is not buried in substrate; tie plant to hardscape above substrate level. Improve water circulation and reduce organic buildup. Remove affected portions with sterile tools if necessary.

Algae Overgrowth on Fronds

Symptoms

Green, brown, or black algae coating leaf surfaces, reduced light penetration to plant tissue

Treatment

Gently brush algae off fronds with a soft brush or cloth. Reduce light duration to 8-10 hours daily and increase water circulation. Add algae-eating shrimp or fish like Amano shrimp or Otocinclus.

Nutrient Deficiency

Symptoms

Pale or yellowing new growth, stunted development, transparent or thin leaves

Treatment

Dose liquid all-in-one fertilizer (containing macronutrients and micronutrients) 1-2 times weekly. Ensure adequate fish waste or consider adding root tabs if using heavily planted tanks.

Melting

Symptoms

Sudden leaf dissolution or transparency, rapid tissue breakdown after planting

Treatment

Ensure proper attachment to hardscape (not buried). Maintain stable water parameters (pH 6.0-8.0, temperature 20-28°C). Improve water circulation and reduce stress from sudden environmental changes.