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Java moss does not have to be planted in the substrate; you can simply tie it to a piece of aquarium decoration or leave it floating around in the aquarium. A free-floating piece of Java moss can, however, be sucked into the filter, so most aquarists prefer to attach the Java moss to something or plant it in the substrate. It can actually do well even above the surface as long as the air is moist. It is, therefore, a great plant for open aquariums and paludariums.
When you attach the Java moss to rock, wood or any other type of aquarium decoration you can for instance use fishing wire. Be careful not to use materials that can pollute the water, e.g. copper wire. The moss will instantly start growing small roots (so-called rhizoids) and try to attach itself to the surface. After a while, the fishing wire is no longer needed since the plant will be secured by the rhizoids.
The moss is a very fast growing plant, and when you have purchased one plant you can easily use it to create new plants for other parts of the aquarium. It can be propagated by simply splitting the plant and moving one of the parts to another place. The moss will often propagate itself in the aquarium since small pieces will fall of the main plant and drift around in the water until they find a new place where they can attach themselves. The moss will also form red-brown sporocarps.
The moss will endure a wide range of different water conditions and temperatures. It is native to warm waters and the preferred temperature range is therefore 64°-86° F (18°-30° C). It will also appreciate a pH between 5.8 and 8.0 but can sometimes adapt to more acidic conditions. Unlike many other tropical plants, this moss does not require strong light and it will actually do best in low or medium strong light. Algae can be a problem for the moss since excessive algae growth on the leaves can harm and even kill the plant.
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