We have a tank containing Marimo moss balls in our teen room. It's time for some of them to move out because they are outgrowing the space. Sounds like a metaphor for growing up doesn't it? :-) A Marimo ball is a rare growth form of algae that is native to Japan and is a symbol of prosperity and love. We've give you everything you need to create a habitat for a teensy-weensy Marimo. Don't worry mom and dad, you don't have to feed or walk them! LIMIT 20 KITS!