Fontinalis Antipyretica

Fontinalis antipyretica

Plantae›Bryophyta›Bryopsida›Fontinalaceae

📍 Northern Hemisphere, widespread

Willow Moss is a native cold-water aquatic moss with delicate, overlapping dark green leaves on branching stems. It prefers cooler water and good flow, making it excellent for coldwater and temperate setups with goldfish, temperate plants, or in nature biotopes. It attaches to rocks and wood and creates a natural, stream-like texture.

Tank Mates

Fancy Goldfish

Goldfish prefer cool water matching Willow Moss requirements; moss provides grazing material and shelter, though goldfish may uproot it if not well-anchored

good

Otocinclus

Small, gentle algae eaters that won't damage moss; thrive in cool, well-oxygenated water with good flow

excellent

Japanese Ricefish

Cold-water compatible, peaceful schooling fish that benefit from moss cover without damaging the plant

excellent

Amano Shrimp

Excellent algae control; peaceful and won't damage moss; prefer similar cool, flowing water conditions

excellent

Java Moss

Complementary moss species with similar care requirements; creates layered, natural aquascaping

excellent

Anubias Barteri

Hardy plant with similar attachment-based growth; both thrive in cool water without CO2

excellent

Common Diseases

Algae Overgrowth

Symptoms

Green or brown algae coating moss fronds, reduced light penetration, moss appears smothered

Treatment

Increase water flow, reduce light duration to 8-10 hours daily, manually remove algae, introduce algae-eating fish like Otocinclus or Amano Shrimp

Melting

Symptoms

Moss fronds turn translucent, mushy, or dissolve; browning and deterioration of tissue

Treatment

Improve water circulation and oxygenation, ensure stable water parameters (pH 6.0-7.5), reduce temperature fluctuations, remove affected portions and allow healthy growth to recover

Nutrient Deficiency

Symptoms

Slow or stunted growth, pale or yellowing fronds, sparse new growth

Treatment

Add all-in-one liquid fertilizer or macronutrient supplements; ensure adequate fish waste in established tanks; maintain moderate lighting

Poor Attachment

Symptoms

Moss floats or drifts instead of anchoring; fails to establish on hardscape

Treatment

Use fishing line or plant weights to secure moss tightly to rocks or driftwood; ensure good water flow to encourage rhizoid development; avoid moving the plant frequently