Phoenix moss

Quick facts

Max height

4 cm

Growth rate

slow

Difficulty

intermediate

Placement

foreground, midground

Propagation

fragmentation

Water parameters

Temperature

18–26°C

pH

5.5 to 7.5

Hardness

0 to 15 dGH

Cold water

tolerated (unheated setups)

Light and nutrients

Lighting

medium

CO2

not required, but boosts growth and color

Substrate

epiphyte

Feeding

feeds from the water column (use liquid fertilizer)

Substrate

What this plant roots into (or attaches to). The substrate affects both plant nutrition and water chemistry; see each linked page for full effects.

This plant feeds primarily from the water column, so substrate choice matters more for its fish-tank compatibility than for plant nutrition.

With fish

Plant-eating fish

safe with plant-eating fish (tough leaves or unpalatable)

Diggers (corydoras, loaches)

fine - root system or attachment style handles it

Root-disturbing fish

tolerates fish that disturb roots

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.

Further reading

• How to cycle a fish tank
• Water chemistry for fishkeepers: pH, GH, KH, and what they mean