10 Marimo Moss Balls -&nbsp; Aquarium Ball Set, 1 Inch Each. Unique Decor for Aquariums and Glass Jar Terrarium Kits. Natural Habitat / for Live Fish, Pet Shrimp, Sea Monkeys, and more by Aquatic Arts Extremely dense and guaranteed to be healthy One of the easiest aquatic plants to take care of; no special lighting required Can be kept in any freshwater aquarium, or even a vase, jar, terrarium, or fish bowl These nano marimo balls are 1 inch or more in size, while other brands sell them as 0.5 inches Moss balls at this size are several years old; they have been known to live for 200 years or longer