Genus
Common name: Derbesia
Scientific name: Derbesia
Derbesia is a genus of filamentous green algae commonly found in marine aquariums. It is often referred to as 'Green Hair Algae' due to its long, hair-like strands. While it can be aesthetically pleasing in small amounts, providing a natural look and refuge for small creatures, it can quickly become a nuisance if left unchecked. It thrives in high nutrient environments and can outcompete corals for light and space. Hobbyists typically control its growth through nutrient management, manual removal, and introducing algae-eating species.