Chaeto Algae, also known as Spaghetti Algae or Green Hair Algae, is an excellent macro algae for refugium. Each cell grows end to end, creating long, stiff strands. It grows in filamentous clumps, resembling a ball of fishing line. Cheatomorpha is a fast-growing, hardy algae that are normally grown in a refugium where it absorbs nitrate and phosphate out of the water as it grows. Additionally, this algae is a great habitat for microfauna such as copepods and amphipods to reside and populate.