The Marimo moss ball, scientifically known as Aegagropila linnaei, is a unique form of filamentous green algae that grows into a compact, velvety sphere. This aquatic organism is popular for its low-maintenance care and distinctive appearance in home aquariums or water-filled vessels. Propagation is often undertaken when a moss ball grows too large, when owners desire more individual spheres, or when a section of the algae needs to be removed due to rot or damage.
Preparing for Division
Before beginning the process, gather all necessary tools and ensure a clean working environment to prevent contamination. You will need a pair of sharp, sterilized scissors or a utility knife to ensure the cut edges of the algae remain healthy. Remove the moss ball from its habitat and gently squeeze the sphere to expel old water and accumulated debris from its core. This makes the algae more pliable and easier to cut. Prepare a separate container with fresh, dechlorinated water to house the newly divided pieces immediately after shaping.
The Propagation Process
Start the division by placing the dampened moss ball on a clean surface and gently pressing it flat. Using the sterilized scissors or knife, cut the algae straight through the center, dividing it into two or more pieces depending on the size of the original sphere and the desired size of the new ones. Avoid tearing the algae, as a clean cut helps the filaments re-bond more efficiently.
The crucial step is to reshape each flat piece into a new sphere by rolling it between your palms. Use a gentle, steady pressure to compress the loose algae filaments into a tight, round structure. The goal is to create a compact, uniform ball that feels firm, which mimics the natural rolling action of lake currents that forms the spheres in the wild. Some hobbyists opt to wrap a thin layer of cotton thread around the newly formed ball to help it maintain its shape during the initial reformation period. Once the new spheres are formed, place them back into the prepared container of clean water.
Caring for New Moss Balls
The newly propagated moss balls require a brief “healing” period, typically lasting a few weeks, to fully re-bond the cut filaments. It is normal for the smaller spheres to float initially because the cutting process traps air pockets and the algae’s photosynthetic activity releases oxygen. The balls will eventually sink as they become fully saturated and the internal air pockets are released, signaling a successful re-formation.
To encourage the new balls to achieve and maintain a spherical shape, perform a gentle rolling action every few days, especially during water changes. This rolling mimics the natural current that shapes the algae and ensures all sides receive adequate light for growth. Maintain the new individuals in cool water and a location that receives low to indirect light, as this prevents browning and discourages unwanted algae. Regular water changes are necessary to remove waste and provide the fresh environment needed for the new algae to establish itself.