found this on line Chaetomorpha Macro Algae, Chaeto, pronounced "kay-toe", is a great way to naturally turn the nitrogenous compounds of your tank into plant food!!! The waste by-products of life, along with the light you provide for photosynthesis, will help this chaeto double in size on a regular basis. The always popular chaeto, works great, and wont go asexual! Chaetomorpha Algae, also known as Spaghetti Algae or Green Hair Algae, is an excellent macro algae for refugiums. Each cell grows end to end, creating long, stiff strands. It grows in filamentous clumps, resembling a ball of fishing line. You can "prune" it and throw it away--or you can compact it for even greater nutrient absorption. If you have a refugium, just throw this clump in there---it's like a Brillo pad--it stays together fairly well. You can also put it into a mesh bag for use in your main tank. There are many different ways you can contain the chaeto in your main tank all the while providing great hiding spots for the tiny "critters" in your tank. This algae is fast growing and is not palatable to many herbivorous species.