The scientific name is Salvinia minima. The common name is Common Salvinia. It is a free-floating, rootless aquatic fern. The leaves are rounded and produce two new leaves at every node. It reproduces by branching off.
Water Sprite
The scientific name is Ceratopteris thalictroides. The common names are Water Sprite, Water Fern, or Indian Fern. It can be planted in substrate, anchored in aquarium decor, or left free-floating. It reproduces by forming little plantlets on the leaf margins.
Java Fern
The scientific name is Microsorum pteropus. The common name is Java Fern. The most common of these ferns are spear-shaped. It reproduces like the watersprite, by forming plantlets on the leaf margins.
Java Moss
The scientific name is Vesicularia dubayana. The common name is Java Moss. It can be planted in substrate or left free-floating. It reproduces by splitting and retataching itself to other material.