These ferns live either wholly or partially submerged. One species is particularly
popular among aquarists.
The species from this genus most often found on the market, is a true fern and
its rhizome must never be buried as it naturally attaches itself to a support (such
as a rock, root, or artificial decor). This attachment can be temporarily encouraged
by tying the rhizome with nylon line, or wedging it between small stones. It grows
slowly and requires normal lighting, water of a moderate density, and a pH of around
7. It can be made to reproduce by cutting off the rhizome when new shoots appear.
Size: 20-30 cm.
This floating fern makes an ideal shelter for new-born fry, or a support for
the bubble nests of the Belontiid family. It grows quickly under strong lighting:
when it takes root - which it does with ease - its coloring turns paler and its
leaves change shape.
The Sumatran fern prefers to be rooted, but it can also survive floating, though
its leaves grow thicker. It is a fast-growing, hardy species. Size: 50-60 cm.