Phoenix moss
Fissidens fontanus
Also known asFontinalis (sometimes confused)
Water parameters
Light and nutrients
Substrate type: epiphyte. Propagation: fragmentation.
Substrate compatibility
| Substrate | pH effect | Nutrient load |
|---|---|---|
| Wood and rock mounts (Hardscape mount) | varies | none |
| Aquasoil (ADA Amazonia) | lowers pH | very high |
| Mineralized clay substrate (Seachem Fluorite) | neutral / inert | moderate |
| Inert sand (Pool filter sand) | neutral / inert | none |
With fish
Origin and habitat
Distributed across temperate regions of North America, Europe, and Asia. The species (Fissidens fontanus, commonly called phoenix moss or fountain moss) is an aquatic moss with a distinctive flat, feather-like frond structure that sets it apart from the more commonly seen Java moss and Christmas moss. Individual fronds are 1–3 cm long, growing in neat, layered rows along the substrate or hardscape. The flat, fern-like growth pattern is unlike the bushy, tangled growth of most aquarium mosses. In the wild, Fissidens grows attached to rocks and wood in cool, clear streams and springs. The species has gained popularity in detailed nano aquascaping for its refined texture.
Care notes
Attach to hardscape (rocks, driftwood, mesh) using super glue or thread. The moss grips surfaces with tiny rhizoids over several weeks. Low to moderate light is sufficient; under high light, growth can become less compact and algae may colonize the delicate fronds. CO2 is not required but improves growth density and frond size. Growth rate is slow to moderate, slower than Java moss or Christmas moss. The flat, layered frond structure is the species' main visual appeal; it creates a refined, fern-like texture that looks more organized than the chaotic growth of Java moss. Trim with scissors to maintain shape; the plant grows outward from attachment points in a layered pattern. Temperature: 15–26°C (prefers cooler water than most tropical aquarium mosses, reflecting its temperate stream habitat). Soft to moderately hard water. Clean water with good circulation benefits the plant because detritus settling on the flat fronds blocks light and promotes algae. Gently wave a hand near the moss during water changes to dislodge settled particles. In nano aquascaping, Fissidens fontanus is used on small stones and wood details where its precise growth pattern creates miniature landscapes. Compatible with all fish and shrimp. The flat frond structure provides excellent biofilm grazing surface for dwarf shrimp, making Fissidens a favorite in caridina and neocaridina breeding tanks. More expensive than Java moss due to slower propagation rates in nurseries.