Fissidens Fontanus

Fissidens fontanus

Plantae›Bryophyta›Bryopsida›Fissidentaceae

📍 North America

A flat, feather-like aquatic moss with a unique branching structure that differentiates it from round-leaved mosses like Java Moss. It attaches readily to rock and wood and grows as a distinctive carpet of interlocking fronds. Slower growing than Java Moss, it produces a tidier, more formal appearance and is popular in Nature Aquarium and Iwagumi layouts.

Tank Mates

Amano Shrimp

Gentle grazers that clean moss without damaging delicate fronds; ideal for planted tanks

excellent

Red Cherry Shrimp

Small, peaceful shrimp that forage among moss without uprooting or destroying it

excellent

Otocinclus

Algae-eating fish that respect moss and help maintain tank cleanliness

good

Ember Tetra

Tiny, peaceful schooling fish that navigate moss without disturbing it

excellent

Anubias Nana

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

excellent

Java Fern

Compatible low-light plant that creates layered aquascaping with Phoenix Moss

excellent

Common Diseases

Algae Overgrowth

Symptoms

Green, brown, or black algae coating moss fronds; reduced water clarity; moss appears smothered

Treatment

Reduce light duration to 6-8 hours daily, increase water changes (30-50% weekly), manually remove algae with soft brush, introduce algae-eating shrimp or fish like Amano Shrimp

Nutrient Deficiency

Symptoms

Slow or stunted growth; pale or yellowing fronds; loss of vibrant green coloration

Treatment

Dose liquid fertilizer containing macronutrients and micronutrients 1-2 times weekly; add CO2 supplementation; ensure adequate lighting (low-medium spectrum)

Melting or Decay

Symptoms

Fronds becoming translucent, mushy, or disintegrating; foul odor from substrate

Treatment

Improve water circulation with gentle aeration; perform 30% water change; remove decaying portions with tweezers; ensure temperature stays within 15-26°C range; check for excess organic waste

Bacterial Infection

Symptoms

Slimy coating on moss; discoloration or blackening of fronds; foul water odor

Treatment

Increase water changes to 50% every 2-3 days; improve water circulation; reduce tank bioload; consider adding beneficial bacteria; maintain stable water parameters