Fissidens Fontanus (Phoenix Moss)

Elegant, feathery, and timelessly beautiful — Fissidens fontanus, commonly known as Phoenix Moss, is one of the most graceful and distinctive aquatic mosses available in the planted tank hobby. Its delicate, fern-like fronds and rich green colouration make it a favourite for aquascapers seeking a natural, flowing texture on driftwood, rocks, and hardscape — and its adaptability to a wide range of conditions makes it accessible to aquarists of all experience levels.

Overview

Appearance

Fissidens fontanus produces delicate, pinnate fronds with pairs of flat, overlapping leaflets arranged along each stem — giving it a soft, feathered appearance reminiscent of a miniature fern. The colouration is a rich, medium to deep green that remains vibrant across a wide range of lighting conditions. When attached to driftwood or rocks, it drapes and spreads naturally over time, creating a lush, aged, forest-floor aesthetic that is deeply sought after in nature aquascaping. Unlike many mosses, its structured frond form retains its shape even in moderate flow.

Water Parameters & Care

• Temperature: 64 – 78°F (18 – 25°C) — prefers cooler water
• pH: 6.5 – 7.2
• General Hardness (GH): 3 – 10 dGH
• Carbonate Hardness (KH): 1 – 2 dKH
• TDS: 100 – 300 ppm
• Lighting: Low to moderate — thrives in low light; moderate light promotes denser growth
• CO₂: Not required, but beneficial for improved growth rate and density
• Fertiliser: Benefits from regular liquid micronutrients

Planting & Placement

Attach portions of Phoenix Moss to driftwood, rocks, or mesh using fishing line, cotton thread, or aquarium-safe glue. It will anchor itself naturally as it grows, eventually covering the surface in a lush, flowing mat. Good water circulation around the moss encourages healthy growth and prevents debris accumulation. Can also be allowed to grow freely as a floating mass or anchored to the substrate as a foreground accent.

Compatibility

Compatible with all freshwater fish and invertebrates. Highly valued in shrimp tanks, where the dense fronds provide excellent foraging habitat, shelter, and biofilm growth for neocaridina and caridina shrimp. Avoid housing with large herbivorous or boisterous fish that may uproot or consume the moss. Pairs beautifully with Anubias, Bucephalandra, Fissidens nobilis, and fine-leaved stem plants for a rich, layered aquascape.

Fissidens fontanus (Phoenix Moss) is a classic, versatile, and enduringly beautiful moss that elevates any aquascape with its natural elegance. Easy to keep, rewarding to grow, and stunning at maturity — a staple for any serious planted tank.