Cladophora Ball Care (Aegagropila linnaei)

This aquatic alga prefers low to moderate light and is easily damaged by strong sun.

• Provide bright, indirect light or light shade for 4–6 hours a day; morning sun filtered through curtains or foliage is usually safe.
• Avoid direct midday or afternoon sun, which can overheat the water, bleach the surface, and cause a Cladophora Ball to yellow or flatten.
• In winter, move containers closer to a bright window or use a low-wattage aquarium light to compensate for shorter days, watching for pale, elongated growth as a sign of insufficient light.

This species lives fully submerged, so water quality and movement matter more than classic soil moisture.

• Use dechlorinated, cool, clean water; change 30–50% every 1–2 weeks, or when water looks cloudy, smells off, or algae film builds on glass.
• Gently swish Aegagropila linnaei in removed tank water and reshape the ball, squeezing lightly to expel trapped debris and air that can cause browning inside.
• Reduce feeding of fish and other nutrients if you see slimy, fast-growing algae on the ball, which indicates excess nutrients rather than a lack of water.

This cold to cool-water alga prefers stable, moderate temperatures without sudden swings.

• Aim for 60–75°F (16–24°C) for steady growth; short exposures down to 50°F (10°C) are usually tolerated if changes are gradual.
• Avoid frost and freezing below 32°F (0°C), which can destroy internal cells, and prevent overheating above 78–80°F (26–27°C), where stress and decay increase.
• In hot summers, place the container away from sunlit windows and electronics, use cooler room locations or partial water changes with slightly cooler water to limit heat buildup.

This aquatic alga does not rely on air humidity, as long as its tank water is stable and clean.

Aegagropila linnaei does not grow in soil; it anchors in or rolls over lake substrates but is kept in clean water in cultivation.

• Place it in dechlorinated, low-nutrient water over inert gravel or sand, avoiding nutrient-rich substrates that promote competing algae.
• Use fine aquarium gravel or smooth sand to stabilize position without burying the ball, which would restrict light exposure and gas exchange.
• Maintain slightly alkaline to neutral water (pH 7.0–8.0) and avoid organic-rich mulms or decaying debris accumulating around it.
• Siphon waste from the tank floor regularly so detritus does not form a soft, anaerobic layer that can lead to decay of the ball’s underside.

This species is very suitable for container culture in aquariums, jars, or bowls.

• Choose a wide, shallow container so the ball can move gently with water flow and receive light on most sides.
• Use clear glass or acrylic only if the container can be shaded partially to prevent rapid algae overgrowth on the vessel walls.
• Avoid placing the container where it is subject to strong vibration or frequent knocking, which can distort the spherical structure over time.

This aquatic alga needs very little feeding, as it absorbs nutrients directly from the water.

Pruning Aegagropila linnaei is minimal and mainly cosmetic, aimed at maintaining a compact, even shape.

• Trim only discolored, decaying, or loose strands using clean aquascaping scissors above a container to catch debris.
• Gently roll the ball between your hands after trimming to restore a uniform spherical shape and even light exposure.
• Limit shaping to the main growing season so the organism can recover and rebuild its surface photosynthetic layer.

This species is not repotted in the usual sense but may need its aquarium or container setup refreshed over time.

• Consider changing to a larger tank or bowl when water parameters become unstable or maintenance becomes difficult.
• Aim for changes during mild indoor conditions, avoiding abrupt temperature shifts when moving the ball between containers.
• Acclimate slowly by mixing portions of old and new water to limit osmotic stress on the algal cells.
• Handle gently and keep the ball submerged while transferring to prevent drying of outer tissues.

Propagation is slow and not always successful, but small divisions can form new balls under stable conditions.

• Use clean scissors to cut a healthy ball into 2–4 equal pieces, avoiding very tiny fragments.
• Perform division in spring or early summer when light levels and temperatures are moderate and stable.
• Gently reshape each piece into a loose sphere and secure with cotton thread if needed to maintain form.
• Provide clean, low-nutrient water, moderate light, and good circulation to encourage gradual, even growth of new spheres.

Indoor-grown Cladophora Ball usually needs only stable, cool-to-room-temperature water during winter.

• Maintain water around 50–75°F, avoiding near-freezing or very warm conditions that stress the algae.
• Keep the container away from cold drafts, unheated windowsills, and heater vents that cause rapid temperature swings.
• Reduce strong lighting and handle less frequently, as metabolic activity naturally slows in cooler, darker months.