Marimo moss balls are spherical algae, native to freshwater lakes in Japan and Iceland. These aquatic plants possess a distinct velvety texture. Known for their longevity, some can live for decades, making them popular, low-maintenance aquatic companions.
Fundamental Care Requirements
Maintaining pristine water conditions is fundamental for Marimo health. Use dechlorinated water, which can be achieved by allowing tap water to sit uncovered for 24-48 hours. Regular water changes prevent the buildup of nitrates and other undesirable compounds.
Marimo moss balls thrive in low to moderate indirect light. Placing them near a window with ambient light, rather than direct sun, is ideal. Direct sunlight can lead to browning or encourage undesirable algae growth, harming the moss ball.
Cooler water temperatures suit Marimo moss balls best, ideally 68 to 78 degrees Fahrenheit (20-25 degrees Celsius). Extreme heat should be avoided, as it can stress the algae and lead to decay. If your environment is warm, consider adding ice cubes made from dechlorinated water to lower the water temperature.
Routine Maintenance and Cleaning
Perform water changes every one to two weeks to keep the environment fresh. Gently remove the Marimo from its container before discarding the old water. Refill the container with fresh, dechlorinated water, ensuring similar temperature to prevent shock.
During water changes, gently rinse your Marimo under cool, running water to dislodge accumulated debris. Periodically, gently roll the moss ball in your hands, mimicking natural currents. This rotational movement helps maintain their spherical shape and ensures all sides receive adequate light, preventing flat spots or discoloration.
Addressing Common Problems
If a Marimo moss ball browns, it often indicates excessive light or poor water quality. Relocate the moss ball to a shadier spot away from direct sunlight. Increasing water change frequency can improve its condition and restore its vibrant green color.
Occasionally, a Marimo moss ball may float due to trapped air bubbles from photosynthesis or a recent water change. Gently squeeze the moss ball underwater to release trapped air, which should help it sink. New moss balls might also float as they adjust to their new environment.
Other types of algae growing on your Marimo can obscure its natural green hue. Gently wipe away unwanted stringy or slimy algae from the moss ball’s surface with your fingers or a soft brush. For persistent cases, placing the moss ball in a dark area for a few days can inhibit external algae growth without harming the Marimo.