Marimo Moss Balls Aquatic small

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Marimo Moss balls   Cladophora aegagropila is an aquatic moss that is slowly formed into a ball over a long period of time.  Originating in very cold rivers and lakes throughout Northern Europe and Japan these Marimo Balls or Moss Balls as they are more commonly take long periods of time to form.  Cladophora aegagropila will not cause algae to form in your tank.  In fact, Marimo Balls will do the opposite by taking nutrients out of the water.  Moss Balls are a different type of algae than those that normally form in an aquarium and are very slow growing.  Cladophora aegagropila comes in a range of sizes with the small size in the 3-4 cm range and the XL size in the 10 cm range.   Marimo Balls are very easy to decorate with and use for aquascaping.      


When you first get your marimo ball, rinse it in aquarium water, place it in the tank, and you’re done! It may float at first but should eventually sink once it becomes waterlogged. They appreciate low to medium light, so keep them out of direct sunlight. Most articles recommend growing moss balls in cooler temperatures because of their native habitats, but many hobbyists have seen success keeping them in betta tanks with temperatures as high as 80°F.

As for maintenance, I recommend lightly rolling the marimo ball in your hands every time you do a water change so that it won’t lose its shape. Also, flip it around occasionally so that all parts of the algae get access to light and won’t start browning.


The good news is that marimo balls are very easy to propagate. Simply squeeze the water out of your moss ball and cut it in half with a knife or scissors. Roll the new clumps in your hands to form little spheres, and tie some cotton sewing thread around them to maintain the shape. Tada, you’ve doubled the number of fuzzy green pets you have!

The bad news is that they grow at the slow, slow rate of 0.2 inches (or 5 mm) per year. In Japan, wild marimo balls can reach 8 to 12 inches in diameter, but most commercially available versions are sold at 2 inches or smaller. (So, if you ever see a really large moss ball in an aquarium, you know the owner deserves mad props because it took ages to get that big.) Some sources recommend using fertilizers and CO2 injection to increase growth rate, 


My final suggestion for marimo balls is that they don’t have to live only as spheres. In nature, Aegagropila linnaei  ( the newest nomenclature) also grows as flat mats on rock surfaces, free-floating filaments, or shaggy sheets on the lake floor. Therefore, aquascapers have gotten very creative with their moss balls, unrolling them into thick carpets, draping them on hardscape, or flattening them to make underwater bonsai trees. Other people don’t even put their marimo balls in fish tanks, but rather place them in beautiful jars to serve as home decor. So, whether you want an undemanding “house plant” or a little tankmate for your fish, you won’t find anything easier to care for than this ornamental algae.

aquascape using marimo moss balls in the foreground

We ship Monday, Tuesday and some Saturdays as weather in your area permits.  We like to have atleast 3 nights above freezing in your area to insure safe shipping.   

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