Mosses are quite easy to cultivate, and they don't take long to give the aquarium or the aquascape a rustic look and a feeling of natural wood- or marshland. More and more moss species have been introduced into the planted tank hobby, and now we have a great number of different mosses to draw upon. Many moss species attach themselves to rocks and driftwood, and thus give the hardscape a very beautiful natural appearance.
Fissidens fontanus is especially popular with aquascapers and planted tank keepers. The smaller mini Fissidens species are significantly more difficult to cultivate and grow much more slowly than Fissidens fontanus.
Riccardia sp., also called coral moss, is another very attractive moss that attaches itself to rocks or driftwood. Many species of the genus Taxiphyllum like classical Taxiphyllum barberi (Java moss) or of the genus Vesicularia, e.g. Vesicularia "Christmas Moss", look like mosses you would find in a forest, and they can add a very natural feeling to an aquarium that is hard to achieve with other aquarium plants.
Mosses offer aquascapers and aquarium keepers in general a great number of uses, and for this reason they are very popular.