Aegagropila linnaei, commonly known as the Marimo Moss Ball, is not actually a moss at all. Instead, it is a rare form of spherical, freshwater green algae.

Interestingly, the scientific name Aegagropila Linnaei – Marimo Moss Ball is used when describing this unique plant. It is native to cool glacial lakes across Japan, Iceland, Scotland, and Estonia. Moreover, these velvety spheres are sculpted naturally by the gentle rolling motion of underwater currents.

They are incredibly easy to care for. They make fantastic “aquatic pets” or aquascaping accents, and can live for well over 100 years.

Quick Plant Profile:

• Scientific Name: Aegagropila linnaei (syn. Cladophora aegagropila)
• Growth Rate: Extremely slow (only about 5 mm per year)
• Size: 2 to 10 cm in diameter
• Water Temperature: Prefers cool water, ideally 10–26°C
• Lighting: Low to medium indirect household light

Core Tank Benefits:

• Natural Filtration: They absorb nitrates and trap organic debris, improving water quality.
• Algae Control: They outcompete nuisance algae by consuming the same nutrient pools commonly occupied by Aegagropila Linnaei – Marimo Moss Ball in aquariums.
• Shrimp Grazing Grounds: The dense, velvety surface area creates an excellent grazing habitat for dwarf shrimp and small fish.

Care and Maintenance Instructions:

Lighting & Placement:

• Keep your moss balls in low to medium indirect light. Avoid direct sunlight, which quickly turns them brown or damages their delicate filaments. They photosynthesize perfectly under normal overhead indoor lighting.

Water & Temperature:

• Perform a partial water change every 1 to 2 weeks using clean, dechlorinated water. Because they originate in glacial lakes, they struggle in hot environments. If your room temperature spikes above 25°C during hot summer months, you can place your containerized moss ball in the refrigerator for up to 24 hours to cool down. This is a useful tip to ensure your Aegagropila Linnaei – Marimo Moss Ball stays healthy.

Keeping the Sphere Shape:

• In nature, waves constantly roll these plants around. In a tank, you must manually rotate them during water changes. This ensures all sides receive adequate lighting and helps maintain their perfect spherical form, just as the Aegagropila Linnaei – Marimo Moss Ball displays in the wild.

Cleaning and Agitation:

• Every few weeks, take the moss ball out of the water and gently squeeze it in a container of discarded tank water. This flushes out trapped detritus and keeps the sphere healthy.