Common name: Red Sea Lettuce

General information

Halymenia duchassaingii, commonly known as Red Sea Lettuce or Dragon's Tongue Algae, is a species of red macroalgae that is highly sought after in the reefkeeping hobby for its vibrant color and unique, leafy appearance. This algae is not only aesthetically pleasing but also serves a functional role in nutrient export, as it can absorb excess nutrients like nitrates and phosphates from the water column.

Care

Red Sea Lettuce is relatively easy to care for, thriving in a range of lighting conditions from moderate to high. It prefers moderate water flow to prevent detritus from settling on its surfaces and to ensure proper nutrient exchange. Regular pruning is recommended to maintain its shape and promote healthy growth. It can be easily propagated by cutting and attaching fragments to live rock or substrate.

Symbiosis

While not known for hosting or forming direct symbiotic relationships with marine animals, Halymenia duchassaingii can contribute to the overall health of the aquarium by providing a natural food source for herbivorous fish and invertebrates. Its dense structure can also offer shelter to small, shy creatures.

Habitat

Halymenia duchassaingii is found in tropical and subtropical waters, often in coral reef environments where it attaches to hard substrates. It can be found at various depths, typically ranging from shallow waters to deeper reef slopes.