Common name: Sea Lettuce

General information

Ulva rigida, commonly known as Sea Lettuce, is a bright green macroalgae widely found in marine environments around the world. It is a popular choice among reefkeeping hobbyists for its ease of care and benefits to the aquarium ecosystem. This species of algae is known for its sheet-like appearance and can grow quite large under optimal conditions, providing a natural and attractive look to the tank.

Care

Sea Lettuce is a hardy species that thrives in a range of lighting conditions, from moderate to high intensity. It prefers clean water with adequate flow to prevent detritus accumulation on its surfaces. Nutrient levels, particularly nitrates and phosphates, should be kept in check as Sea Lettuce can absorb these compounds, aiding in nutrient control within the aquarium. Regular pruning is recommended to maintain its size and to prevent it from overshadowing other inhabitants.

Symbiosis

While not hosting a wide array of symbiotic relationships like some corals or anemones, Sea Lettuce can provide a habitat and food source for a variety of small invertebrates and fish. It can also be part of a refugium setup, where it helps to create a natural filtration system by absorbing excess nutrients and providing shelter for microfauna.

Habitat

In the wild, Ulva rigida is commonly found in shallow, intertidal zones, and estuaries where it attaches to rocks or other hard substrates. It is a cosmopolitan species, tolerating a wide range of temperatures and salinities, which makes it adaptable to various conditions found in home aquariums.