Care at a glance
A premium feature moss, small, fern-like fronds that hug stone. Slow growth means it stays compact and ornamental for months between trims.
By Mike ElmiraUpdated 1 min read
Part of our complete guide to aquatic mosses.
Moss
Phoenix Moss / Fissidens
Fissidens fontanus
Eastern North AmericaIntermediate
TL;DR, Phoenix Moss / Fissidens
A premium feature moss, small, fern-like fronds that hug stone. Slow growth means it stays compact and ornamental for months between trims.
Phoenix Moss / Fissidens (Fissidens fontanus) is a moss aquatic moss native to Eastern North America. Light: medium. CO₂: recommended. Growth rate: very slow. Target 18–26 °C and pH 6.0–7.5. Attach via wood, stone (slow to attach). Typical use: detailed hardscape feature moss. Trimming: Rarely, just remove detritus carefully
- LightMedium
- CO₂Recommended
Hero photo by Njmeyer03 · CC BY-SA 4.0 · Wikipedia
Tank fit
The parameters that decide whether phoenix moss / fissidens fits in your tank.
Parameters
15 °C20 °C25 °C30 °C
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Low
Medium
High
None
Optional
Recommended
Required
Slow
Medium
Fast
V. fast
Still
Low
Medium
High
V. high
Profile
Family
Fissidentaceae
Type
Moss
Attachment
Wood, stone (slow to attach)
Typical use
Detailed hardscape feature moss
Trimming
Rarely, just remove detritus carefully
Habitat
Wet rocks in fast-flowing Southeast Asian streams
Eastern North America
Who it lives with
Tank-mate safety and the species this one is documented to thrive (or fail) alongside.
Pro tips
Hard-won lessons from the tank.
A specialty moss — slow, beautiful, expensive. Best on a feature rock or piece of driftwood where it can be appreciated up close. Don't mix with fast-growing mosses or it'll be smothered.
Things to watch for
What can go wrong and how to spot it.
Things to watch for
Failure modes, in order of how dramatic the fix is.
Algae
Algae issues
Less prone to algae than other mosses due to dense fronds that resist attachment.
Common mistakes
Common mistakes
1) Impatience with attachment. 2) Mixing with Java moss — Java overgrows it. 3) Buying without checking the specific species — multiple Fissidens look similar but have different care.
How to care for it
The practical routine, read top to bottom.
Tying / attachment
Slow to attach (8–12 weeks). Use thin cotton thread; press into crevices of porous stone.
Tank setup
Medium light, CO₂ recommended for compact growth. Cool water (20–24 °C) preferred.
Background
Where it comes from, how it behaves, and the variants you'll see at retail.
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In the wild
Where it lived before it came home.
Native rangeEastern USA
Origin · Eastern North America
Submerged on rocks in cool, slow streams of the eastern United States.
Emersed form
Rare — primarily an aquatic moss.
Variants & identification
The named cultivars and the lookalikes worth flagging.
Variants
Just F. fontanus typically. Other Fissidens sold as 'Mini Fissidens', 'US Fissidens', etc.
Identification
Small fern-like fronds growing in tight clusters. Very ornamental — looks like miniature aquatic ferns.
Sister species
F. nobilis, F. splachnobryoides, F. zollingeri — multiple Fissidens species in the trade.
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
How do you attach Phoenix Moss / Fissidens in an aquarium?
Attachment: Wood, stone (slow to attach) Typical aquascaping use: Detailed hardscape feature moss
Does Phoenix Moss / Fissidens need CO₂?
CO₂: recommended. Light: medium. Growth rate: very slow.
What water parameters does Phoenix Moss / Fissidens need?
Phoenix Moss / Fissidens (Fissidens fontanus) tolerates 18–26 °C and pH 6.0–7.5. Flow: medium.
How do you trim Phoenix Moss / Fissidens?
Rarely, just remove detritus carefully
Is Phoenix Moss / Fissidens beginner-friendly?
Difficulty: 3/5. Intermediate, stable parameters and a mature tank matter.
Sources & further reading
More mosses
See all mossesAdjacent specimens in the catalogue.
Cross-references
Build the rest of the tank.
A planted tank is a system. Pair this moss with one entry from each other pillar to plan the whole scape.
