Genus
Common name: Phormidium
Scientific name: Phormidium
Phormidium is a genus of filamentous cyanobacteria commonly found in marine environments, including reef aquariums. These organisms form mat-like structures and can be various colors, from green to black. They are known for their ability to photosynthesize, contributing to the oxygen content in the tank. However, in excessive amounts, they can become a nuisance by overgrowing and smothering corals and other sessile invertebrates. Maintaining good water quality and proper lighting can help control their growth.