What is a Japanese moss ball?

Asked By: Tiziano Csordas | Last Updated: 18th February, 2020
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Kützing. Marimo (also known as Cladophora ball, moss ball, moss ball pets, lake ball, or mossimo) is a rare growth form of Aegagropila linnaei (a species of filamentous green algae) in which the algae grow into large green balls with a velvety appearance.

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Hereof, what are Japanese moss balls called?

Cladophora aegagropila are more commonly known as Marimo moss balls. The name "Marimo" was bestowed by a Japanese botanist -Tatsuhiko Kawakami in 1898. The name, however, is somewhat of a misnomer as 'mari' means ball and 'mo' means algae in Japanese.

One may also ask, is a moss ball alive? Will live and grow best in cool water below 77°F (25°C). If the temperature is too hot, they can be placed in the refrigerator for up to 48 hours but will not survive in the freezer. Change the water and clean marimo moss balls every one to two weeks—more often in summer and less often in winter.

Similarly, it is asked, what do you do with a moss ball?

Marimo Moss Ball Benefits in Aquariums

  1. Absorbing Pollutants. Marimo moss balls absorb pollutants such as phosphates, nitrates, ammonia, and other waste solid debris in the surrounding water.
  2. Creates Oxygen.
  3. Carries No Parasites.
  4. Resilience.
  5. Prevents Growth of Other Algae.
  6. Free Floating.
  7. No Dead Plant Parts.
  8. Salt Tolerance.

How do you make a Japanese moss ball?

Creating Your Japanese Moss Ball Moisten the moss if it's the dried variety by soaking in a bucket of water for an hour. Squeeze it out and lay aside until the last step. Add water gradually to your akadama mixture until the medium can be gathered into a ball. Press it firmly all around to adhere the soil mixture.

39 Related Question Answers Found

Should Marimo balls float?

More than likely, your Marimo balls have an air bubble trapped inside that is causing them to float! Gently squeeze your marimo balls to pop the air bubble. Generally, Marimo will sink to the bottom of their tank within 1-2 days of being added to an enclosure.

Can moss balls kill fish?

It's just a fake ball of moss that actually a hollow structure filled with activated carbon and covered in green fuzzy stuff. So yes it's safe to put either kind in the tank, but make sure you change it out about once a month or the carbon will start redepositing everything bad it absorbs and kill the fish.

Why are my moss balls floating?

During the day, bubbles form within the spherical balls of Aegagropila linnaei algae, making them float to the surface of the water. Since there's less light at lower depths (like at the bottom of a lake), marimo float to the top of the water to maximize their potential for photosynthesis each day.

Can you touch Marimo moss balls?

Floating Marimo likely means that there are air bubbles trapped inside the balls. You can gently squeeze the Marimo while holding it under water to let the air bubbles out.

Do moss balls create algae?


Actually Marimo moss balls are not moss at all, they are a type of algae, Cladophora (not sure of spelling) I believe. And yes they are known to spread algae because they are made of algae. The reason some say they can help with algae is they can outcompete other algae for nutrients.

How long do moss balls last in a fish tank?

How long can my Moss Ball Pet™ last without water? In ideal conditions, Moss Ball Pets™ can live for one month without water. It is not recommended to keep your Moss Ball Pets™ out of water for any extended period of time.

How do you keep moss balls alive?

Care Instructions for Marimo Moss Balls
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.

Do moss balls have babies?

It Does Not Reproduce
While aquatic plants spawn over time, Moss balls won't reproduce in your tank—they just get bigger. So you won't find little baby moss balls or patches of the algae. It can be years until a baby moss ball grows to golf ball size.

Do fish eat moss balls?


Marimo moss ball is perfect for small fish and shrimps
If you keep this lovely plant with fish, make sure they don't enjoy it too much; freshwater fish love plants and if they eat from it too much, they will destroy the shape of the plant and eventually it will die.

Are moss balls good for bettas?

Marimo moss balls can live in the same water parameters that bettas thrive in, however they do grow faster in colder temperatures. Moss balls also work to retain good tank bacteria, emit oxygen, and reduce nitrate levels which can stress betta fish health at high levels.

Do moss balls reproduce?

They usually reproduce through budding. This is an asexual form of reproduction that can take place when the moss ball is big enough and has enough room to continue growing. You might notice a little bump forming on its rounded surface and that is how you can tell that it is creating another marimo!

Do moss balls make water cloudy?

The moss balls are most likely not causing the cloudy water. Don't worry about the water, it happens when you get a new tank and should go away within a couple days, and wont harm your fish. Some other aquatic plants may cause cloudy water or algae, but the cloudy water you have now is normal.

Can you cut a moss ball in half?

Cut each half of the moss ball in half. If the resulting pieces are larger than 2 to 3 inches, cut them each in half. Moss balls don't have a kernel or central structure, so it's fine to cut it through the center and in any direction.

Why does my moss ball smell?


A: As long as the marimo balls are all green and healthy looking. The smell is a result of being in the same water for too long in warmer temperatures. Once they are cleaned and placed in fresh water, the smell should reside.

How much does a moss ball cost?

Marimo balls grow very slowly, and usually cost around ten bucks at the pet store.

How do you clean moss balls?

How to Clean Your Marimo Moss Balls
  1. First, remove them from the water and set them in a bowl.
  2. Wash the bowl, rocks, and any decorative items with gentle dish soap and warm water.
  3. Rinse the Marimos under tepid, running water by gently squeezing out the water and allowing them to fill again.