Bolbitis
These ferns live either wholly or partially submerged. One species is particularly
popular among aquarists.
Bolbitis heudelotii
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.
Ceratopteris cornuta
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.
Ceratopteris thalictroides
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.
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