Common name: Mermaid's Fan

General information

The Mermaid's Fan, scientifically known as Udotea flabellum, is a species of green macroalgae that is popular among saltwater aquarium enthusiasts for its unique fan-shaped appearance. This alga is not only aesthetically pleasing but also serves an important role in nutrient export, helping to maintain water quality by absorbing excess nutrients such as nitrates and phosphates.

Care

Caring for Udotea flabellum requires a tank with stable water conditions and moderate to high lighting to support photosynthesis. It prefers a strong water flow, which helps to deliver nutrients and remove waste products from its surface. Calcium levels should be maintained as this alga uses calcium carbonate to build its structure. It can be easily propagated by fragmentation, making it a sustainable choice for aquarists.

Symbiosis

While Udotea flabellum does not have any specific symbiotic relationships akin to those seen in coral or anemone species, it does contribute to the overall ecosystem of a reef tank. It provides a natural food source for herbivorous fish and invertebrates and can also offer shelter to small organisms.

Habitat

In the wild, Udotea flabellum is commonly found in shallow, tropical marine environments such as lagoons and seagrass beds. It is often seen anchored to sandy or rocky substrates where it can access ample sunlight for growth.