Marimo Moss Ball
Aegagropila linnaei
Edited by Ivan F. · Reviewed
Beginner verdict
Not really a moss but a round ball of green algae that grows very slowly and needs almost no care. It suits cooler tanks, and shrimp love to graze on it. Roll it gently now and then to keep it round, and rinse it to clear away trapped dirt.
- Light
- Low
- CO2
- Not Needed
- Growth
- Slow
- Placement
- Foreground
- Max height
- 4 in (10 cm)
- Temperature
- 59–75 °F (15–24 °C)
- pH
- 6–8.5
- Needs substrate
- No
Marimo Moss Ball care mistakes to avoid
- Check that any new ball comes from a trusted seller, as some have carried invasive mussels.
- Keep it out of warm tanks, since it prefers cooler water.
- Shield it from strong light, which can turn it brown.
- Rinse and gently squeeze it during water changes to remove trapped dirt.
How it spreads
Very slow. Larger balls can be gently split, then rolled by hand into new shapes.
Marimo Moss Ball FAQ
How tall does Marimo Moss Ball grow?
Tropica lists growth to about 10 cm (4 in) in a tank, and it can grow larger over time.
What light does Marimo Moss Ball need?
Tropica rates its light demand as low. Most standard aquarium lights are enough.
Why is my marimo turning brown?
Too much heat or light is the usual cause. Move it to a shadier spot, keep the water cool, and rinse it gently.
Why does my marimo float?
Trapped air bubbles usually lift it. Gently squeeze it underwater, and it will sink again.
Where to buy Marimo Moss Ball
We have not found a store that sells Marimo Moss Ball under its scientific name yet. We add stores as we confirm them.
Live animals and plants travel by courier. Check the store's live-arrival guarantee, and only buy once your tank has cycled (see how to cycle a fish tank).
Some US states restrict certain species. Check our US state aquarium rules table and your state's own rules before you buy.