General description 100% brand new and high quality MARIMO live moss ball suitable for cold or tropical aquariums. Marimo is a very popular plant in Japan, believed to bring good luck. It makes a great gift for friends or loved ones to signify eternal love. This plant requires negligible maintenance and is safe for shrimp. Technical specifications Size: 24 cm Quantity: 5 PCS Giant Marimo Moss Balls Usage Ideal for getting rid of pond algae and algae in the aquarium, as the moss ball competes with algae for nutrients. Can be used in ponds to help flush out nutrients that cause green water. Requires no carbon dioxide injection for healthy growth.