Common name: Bubble Algae

General information

Valonia macrophysa, commonly known as Bubble Algae or Sailor's Eyeballs, is a species of green macroalgae that is often found in marine aquariums, either introduced unintentionally or as a decorative element. This species is characterized by its distinctive, large, spherical vesicles that can grow up to 5 centimeters in diameter. The vesicles are filled with water and can appear quite attractive due to their shiny, bubble-like appearance. However, they can become a nuisance in reef aquariums as they can grow rapidly and outcompete other sessile organisms for space and resources.

Care

Bubble Algae can be difficult to control once established, as they adhere strongly to substrates and can regenerate from small remnants. Manual removal is the most common method, but care must be taken to avoid breaking the vesicles, which can release spores and exacerbate the problem. Some aquarists use specific herbivorous fish or invertebrates, such as the Emerald Crab (Mithraculus sculptus), to help control the population of Bubble Algae in their tanks.

Symbiosis

While Valonia macrophysa does not have any notable symbiotic relationships in the aquarium setting, it is an important part of the natural reef ecosystem, providing habitat and food for a variety of marine life.

Habitat

In the wild, Bubble Algae is commonly found in shallow, tropical marine environments attached to rocks, coral rubble, or other hard substrates. It is distributed widely across the Indo-Pacific region.