- Scientific name: Versicularia montagnei
- Synonym: -
- Common name: Christmas Moss, Xmas Moss
- Family: Hypnaceae
- Group: Aquarium plants
- Max height: 9 cm
- Distribution: Southeast Asia
- Habitat: Found mainly emersed, on moist shaded riverbanks.
- Substrate: Rocks, wood
- Placement in aquarium: Foreground or it can be attached to wood or rocks.
- Planting density: 1 clump for 15 cm2
- Lighting needs: Low to High
- Temperature: 18-24 °C
- pH: 5-7,5
- Hardness: 9-13 NK°
Description: Christmas Moss is a recent addition to the hobby, that is usually used in planted aquariums. It first appeared in the mid-2000s, but still botanists are uncertain of its proper classification and exact geographic origin. However Versicularia montagnei appeared first in asian aquariums, because the hobbyists found its frond structure unique and interesting. As other mosses, it is undemanding and require little attention to grow. Christmas Moss is a slow growing species that does not require extensive CO2 or other fertilization and does not need too much light. The best growth can be achieved in cooler waters (18-24 °C) by injected CO2 and with moderate lighting. The triangular leaves are around 1 to 1.5 mm long and the bright green plant is resembling a christmas tree. The emersed form has almost round to wide-oval leaves. Under low light, this moss grows remarkably denser and the fronds are more compact and is often much less organized in structure. Over 25 °C the plant will suffer and grows more slowly. Versicularia montagnei is very similar to Java moss, but can be identified by its more regular branching pattern and slightly different leaf shape. Christmas Moss is often used in planted tanks, as it can be attached to driftwood, stones, and other objects. Christmas Moss can be used in coldwater aquariums and is ideal for breeding tanks as it can be used as spawning ground and the fry can also use it as hiding place.
To propagate simply pull clumps from the parent moss and attach them to their new location.
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