Java Moss

Java moss is the most widely kept moss in the freshwater aquarium hobby, valued for its undemanding nature and the lush green texture it adds to any aquascape. The plant sold under this name in the trade is Taxiphyllum barbieri, not the true Vesicularia dubyana (Singapore moss), which was the original Java moss until the faster-growing T. barbieri supplanted it in cultivation. The species is native to Vietnam and has been recorded by botanists only from that country, although it has been naturalised in aquaria worldwide. Java moss attaches itself to wood, stone, and even glass via small brown rhizoids, making it an excellent choice for covering hardscape or creating a background wall on a Hamburg Mat filter. It grows under an extraordinary range of conditions: light can be as low as 0.15 watts per litre or as high as full-intensity LEDs, and CO2 injection is not required, though it helps produce a more compact growth form. The ideal temperature range for robust growth is 20 to 30°C, with the plant tolerating short excursions outside this range. In cooler water the shoots become darker and more compact; in warmer conditions they grow spindlier and paler. Fertiliser improves growth rate, but Java moss will survive and spread even in a low-tech tank with minimal maintenance. It is an ideal refuge for shrimp fry and fish larvae, providing both cover and a surface for the microorganisms they feed on. Propagation could not be simpler — cut off a portion and it grows. Trim with scissors to shape; the moss does not sulk and regrows from the base.