Step 6: Add a Shell
Give your arrangement another aquatic accent by placing a sea shell or starfish in the container. Nestle it in the gravel while still providing enough room for the Marimo moss balls.
Step 7: Position the Moss Balls
Now place the clean Marimo moss balls in the container. This one had room for two to sit comfortably side by side. Remember that they will expand in water and continue to grow slowly. Also, selecting two balls of different sizes makes for a more visually pleasing arrangement.
Step 8: Fill With Water
Carefully fill the container with water that is cool or room temperature. Distilled water is optimal, but you can also leave your tap water out on the counter for 24 hours, and that will do the trick. When you add the water, the moss balls may float.