Common name: Calcareous Green Seaweed

General information

Halimeda tuna, commonly known as Green Cactus Algae or Segmented Halimeda Algae, is a species of calcareous green macroalgae that is popular in marine aquariums for its unique appearance and utility. It is part of the Halimedaceae family and is known for its segmented, flat, leaf-like structures that resemble cactus pads. This algae is not only aesthetically pleasing but also plays a role in the biological filtration of the aquarium by absorbing nutrients such as nitrates and phosphates.

Care

Caring for Halimeda tuna requires a stable marine aquarium with adequate lighting and water flow. It prefers strong lighting to support photosynthesis and will benefit from the addition of calcium and magnesium to maintain its calcareous structure. It is important to monitor nutrient levels, as this algae can deplete calcium rapidly in a closed system. Halimeda tuna can be easily propagated by fragmentation, where pieces that break off can reattach to the substrate and grow.

Symbiosis

While Halimeda tuna does not have the same type of symbiotic relationships as some corals or anemones, it does provide a habitat for small invertebrates and can contribute to the overall health of the reef ecosystem by producing oxygen and removing excess nutrients.

Habitat

Halimeda tuna is found in tropical and subtropical oceans around the world. It typically grows in shallow waters on coral reefs, seagrass beds, and sandy substrates. In the wild, it can be found at various depths, often forming dense meadows that serve as important ecological habitats for a variety of marine life.