How Big Is A Marimo Ball?

35 CM Large Marimo Moss Ball (Set of 3)
35 CM Large Marimo Moss Ball (Set of 3) from

Marimo balls are some of the most fascinating and mesmerizing aquarium decorations out there. Their spherical shape, soft texture and vibrant green color make them a popular choice for aquarium enthusiasts, as they bring a sense of life and beauty to any tank. But despite their popularity, few people know how big is a marimo ball.

The answer is that marimo balls can range in size from extremely small to quite large. The smallest marimo balls are typically around the size of a pea, while the largest can reach up to the size of a grapefruit. The exact size of a marimo ball depends largely on its age and the conditions in which it is kept.

Marimo balls are made from a type of green algae that grows in cold, nutrient-rich waters. They are believed to have originated in Lake Akan in Hokkaido, Japan, where they have been kept as a cultural symbol for centuries. They are naturally slow-growing, but with the right care, can reach impressive sizes.

How to Grow Your Marimo Ball

If you want your marimo ball to reach its full size potential, there are a few things you should do. First, make sure that your marimo ball is kept in clean water with plenty of nutrients. Marimo balls do not require a lot of light, so you can keep it in a low-light area of your aquarium.

Second, you should change the water in your tank regularly. Marimo balls need a fresh supply of nutrients to keep growing, so it’s important to do regular water changes in order to provide them with the necessary nutrients. You should also avoid using harsh chemicals or medications in your tank, as these can be harmful to your marimo ball.

Finally, you should rotate your marimo ball regularly. This will help it to grow evenly and prevent it from becoming misshapen. A good rule of thumb is to rotate it once a week. You can do this by gently lifting it out of the water and turning it a few times before putting it back in.


Marimo balls are a unique and beautiful addition to any aquarium. They come in a range of sizes, from pea-sized to grapefruit-sized. The exact size of your marimo ball will depend largely on its age and the conditions in which it is kept. With the right care, you can ensure that your marimo ball reaches its full potential. So, keep your marimo ball clean, provide it with plenty of nutrients, and rotate it regularly for best results.

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