Common name: rock-weed

General information

Cladophora rupestris, commonly known as Green Hair Algae, is a species of filamentous green algae that is both admired and dreaded by aquarists. In the wild, it forms dense mats on rocks and can be found in a variety of marine environments. In the aquarium, it can be a decorative plant that oxygenates the water and provides a natural look, but it can also become invasive if not properly managed.

Care

Green Hair Algae requires moderate lighting and a good flow to thrive in an aquarium setting. It absorbs nutrients such as nitrates and phosphates from the water, which can be beneficial in controlling nutrient levels. However, if these nutrients are in excess, Cladophora rupestris can grow out of control, outcompeting other algae and even corals for space and resources. Regular maintenance and nutrient control are key to keeping its growth in check.

Symbiosis

While not known for any specific symbiotic relationships, Green Hair Algae can provide microhabitats for small invertebrates and can be a grazing area for herbivorous fish and invertebrates, which in turn help control its growth.

Habitat

Cladophora rupestris is found in a wide range of marine environments, from shallow waters to depths where light can still penetrate. It is commonly seen in the intertidal zones, attached to rocks and other hard substrates.