Java Moss (Versicularia dubyana) is a common aquarium moss belonging to the Hypnaceae family. It attaches to rocks and roots and to driftwood. It is a slow starter until it has established itself.

Java Moss does not require any special attention. It accepts all kind of waters, even weakly brackish, and all kind of light qualities at a wide range of temperature.

It is especially popular among aquariasts raising fry (baby fish), to protect them from cannibalistic adults.