Marimo Moss Ball Care

Marimo Moss Ball Care

Common Name: Marimo Moss Ball

Latin Name: Aegagropila linnaei

Sold as: Circular Moss Balls

Tank Placement: Foreground

Max Size: 8-12 inches

Temperature: 60-86 degrees

pH: 6.0-8.5

Growth Rate: Extremely Slow

Propagation: Division

Lighting: Any

Supplements: Not necessary

Difficulty: Easy

Good for Beginner: Yes

When I first got them over 12 years ago, I used to take these marimo moss balls out of the aquarium once a month for 24 hours and place them in a container (bucket) and dose with fertilizers for the Marimos to absorb the nutrients.

Now, I just do monthly maintenance, squeeze the water and let the marimo float in my tank. This is my way to simulate their natural environment by letting them rotate so all the sides receive light. If neglected on the bottom of the tank, the part of the Marimo that sits on substrate will turn brown due to lack of lighting.

Some No-Nos based on my experience:
1. They don't do well with bleach and hydrogen peroxide dips
2. Placing them in direct intense (summer) sunlight in small containers will burn them if kept there to long.
3. They are known to carry hitchhikers so I would QT new ones especially if they were grown in ponds.

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4.82 star(s) 11 ratings

Latest reviews

Very informative but yet simple and short.
Excellent! I currently have 1 1/4", 2 3/4", 1 1" and 1 1.6" moss balls. I have one that turned brown and now it's turning green again!!!
Good but simple.
Great info! I currently have two, one of which I believe has quite the ‘sunburn’. It’s pretty much completely white in color all around the outside, not any black yet or and shedding from what I can tell. So I am wondering, can a Marimo come back from turning white?
Nice short caresheet. Really doesn't need much more since they're so easy to keep.
Great Article! Short and Concise. This article actually helped me with my Marimo Ball Placement!
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  • 5.00 star(s)
The information is clear and concise. I have a few in all of my tanks but as other readers / posters have stated, I hadn't given them much thought. This write up just made the plant much more interesting to me. Kudos!
I have 3 large in my 5.5 gallon tank and never thought about this. I just finished doing a water change in my tank and I did just that without realizing why. I just thought they looked dirty and a little brown, but now that I know I will do it often. Thanks for the advice!
These act like a natural filter as well but do that best in smaller tanks. Fin fact: Largest moss ball on record was 200 years old and 37 inches in diameter.
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