Aquatic Arts - 3 Marimo Moss Balls - 1.5 Inches 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. Will arrive in a rigid container, not a plastic bag, to ensure your Marimo do not arrived smashed. Moss balls at this size are 6 to 10 years old. They have been known to live for 200 years or longer.