String Moss

Leptodictyum riparium

Plantae›Bryophyta›Bryopsida›Amblystegiaceae

📍 Cosmopolitan (worldwide)

A stringy, long-stranded moss with thin, delicate shoots that grow in loose, flowing tangles — giving it a wild, natural look unlike the denser Christmas or Java moss. Often used to create shaggy, overgrown effects on driftwood or as a hiding place for fry and shrimp. Also used in Wabi-kusa style arrangements. Grows faster than many mosses and can be difficult to manage if left untrimmed but is very undemanding.

Tank Mates

Red Cherry Shrimp

Shrimp use moss as grazing ground and shelter; moss provides biofilm without being damaged

excellent

Amano Shrimp

Large shrimp that benefit from moss cover and help control algae without harming the plant

excellent

Otocinclus

Peaceful algae eater that won't uproot or damage delicate moss strands

good

Ember Tetra

Small, gentle fish that use moss for shelter and won't damage the plant

good

Dwarf Gourami

May nibble moss occasionally; monitor behavior but generally compatible

caution

Java Moss

Excellent companion plant with similar care requirements; creates dense natural layouts together

excellent

Common Diseases

Algae Overgrowth (Green Spot, Hair Algae)

Symptoms

Visible green or brown algae coating moss strands; reduced light penetration; moss appears smothered

Treatment

Increase water changes, reduce light duration to 6-8 hours daily, add algae-eating shrimp or fish (Amano shrimp, Otocinclus), manually remove affected portions

Melting (Tissue Decay)

Symptoms

Moss strands become translucent, mushy, or dissolve; browning of tissue

Treatment

Improve water circulation, check water parameters (pH 5.5–7.5, low ammonia/nitrite), increase water changes, remove dead portions, ensure adequate light

Nutrient Deficiency

Symptoms

Slow growth, pale or yellowish coloration, weak structure

Treatment

Dose liquid all-in-one fertilizer weekly, ensure moderate lighting, check for adequate CO₂ in high-light setups

Black Beard Algae (BBA)

Symptoms

Black or dark red fuzzy growth on moss strands; plant appears covered in dark film

Treatment

Reduce light to 6 hours daily, increase water flow, perform 50% water changes twice weekly, manually remove affected moss, add algae-eating shrimp or increase CO₂

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Quick Facts

co2: Not required
light: Low to medium
max size: Strands can exceed 10–15 cm (4–6 in)
placement: Midground / hardscape
substrate: None — attach to hardscape or float
growth rate: Medium to fast

Water it likes

ph: 5.5–7.5
notes: Long stringy growth gives a wild, natural appearance. Trim regularly to prevent it overtaking other plants.
hardness: 0–12 dGH
temperature: 138–180°F (59–82°C)