Cladophora aegagropila

Scientific name: Cladophora aegagropila

Family: Cladophoraceae

Maximum size reached under cultivation: 2 - 10 cm (0.79 - 3.94 inch)

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Recommended pH range: 6.2 - 8

Recommended water hardness: 12 - 30°dGH (214.29 - 535.71ppm)

0°C 32°F30°C 86°F

Recommended temperature range: 15 - 27 °C (59 - 80.6°F)

Preferred propagation method: Cuttings

Native to: Europe

Growth rate: Slow

Recommended substrate: Rocky

Lighting requirements: Medium

Ideal placement in tank: Midground

🌱 Common Names

Marimo Moss Ball, Lake Ball, Cladophora Ball, Moss Ball

🌍 Origin

Cladophora aegagropila is native to cold freshwater lakes in Europe and parts of Asia, including Iceland, Estonia, Japan, and Russia. In Japan, Marimo is considered a national treasure and is even cultivated commercially for aquarium use.

🏞️ Planting Area

This is a free-floating, non-rooted algae species. Simply place the ball on the aquarium substrate or any surface. It does not attach like traditional plants and may slowly roll around with the current, mimicking its natural behavior in lakes.

💡 Lighting Requirements

Moderate lighting is ideal. In low-light conditions, the Marimo may gradually lose its vibrant green color and turn brown. Avoid direct, intense light, which can cause overheating and damage. Rotating the ball regularly ensures even exposure and healthy growth.

🌱 Propagation

Cladophora aegagropila reproduces through manual division. A mature Marimo ball can be gently split into smaller pieces. Though the fragments may initially lose their spherical shape, they will gradually reform into balls with time, circulation, and gentle rolling. Growth is slow, so patience is needed.

💧 Water Parameters

• Recommended temperature: 15-27°C (59-81°F)
• Recommended pH: 6.2-8.0
• Water hardness: soft to medium

⚙️ Difficulty

Very easy. Marimo is one of the most beginner-friendly aquatic organisms. It tolerates a wide range of conditions, requires minimal care, and thrives in low-tech setups.

📝 Short Description

Often mistaken for moss, Cladophora aegagropila is actually a species of filamentous green algae that naturally forms velvety, spherical colonies in cold lakes. These unique green balls are not only decorative but also functional, offering hiding spots for shrimp and fry while absorbing excess nutrients from the water. Unlike typical aquarium plants, they require no trimming or rooting, making them ideal for minimalist, low-maintenance aquascapes.

Marimo grows slowly, maintains its shape with gentle handling, and brings a natural charm to any aquarium. Their unusual shape and ease of care make them a popular choice for shrimp tanks, nano setups, and even as living "pets" in jars.

❓ FAQs

• Can Marimo Moss Balls float?

  Yes, they may float due to trapped air or oxygen from photosynthesis. Simply squeeze the ball underwater to release the air bubbles.

• How often should I clean Marimo balls?

  Every 2–3 weeks, gently roll and squeeze them in dechlorinated water to maintain their shape, remove debris, and keep them healthy.

• Do Marimo balls need fertilizers?

  No. They do well without fertilizers, especially in low-tech tanks. However, they benefit from clean water and occasional mineral supplementation in very soft water.

• Why is my Marimo turning brown?

  Discoloration may be caused by poor water quality, lack of light, or still water. Rotate the ball regularly, ensure water flow, and provide moderate lighting.

• Can Marimo be kept with shrimp and fish?

  Yes, completely safe. Shrimp and fish enjoy grazing on the biofilm that forms on the surface. Marimo provides both enrichment and shelter.