Common name: Razor Caulerpa

General information

Caulerpa scalpelliformis, commonly known as Razor Caulerpa or Scalpel Weed, is a species of green macroalgae that is popular among marine aquarists for its unique appearance and utility in nutrient export. This alga is characterized by its long, blade-like fronds that resemble the shape of a surgeon's scalpel, hence the name. It is a fast-growing species that can help outcompete nuisance algae by absorbing excess nutrients such as nitrates and phosphates from the water column.

Care

Razor Caulerpa is relatively easy to cultivate in a reef aquarium, provided it has access to moderate lighting and water flow. It can be attached to live rock or placed in a refugium where it can grow without competing with corals for space. Regular pruning is necessary to prevent it from overgrowing and potentially releasing toxins if it dies back. It's important to monitor its growth and keep it under control to prevent it from overtaking the tank.

Symbiosis

While not known for hosting or forming direct symbiotic relationships with marine animals, Caulerpa scalpelliformis does contribute to the overall health of the aquarium ecosystem by providing a natural form of nutrient control and habitat for small microfauna.

Habitat

Caulerpa scalpelliformis is found in tropical and subtropical oceans worldwide. It typically grows in shallow waters, often on rocky substrates or coral rubble where it can form dense mats. In the aquarium, it can adapt to a range of conditions but thrives best with stable water quality and temperatures consistent with typical reef environments.