Chaeto (Chaetomorpha linum) – Complete Care Guide

General Information

Chaetomorpha linum, commonly known as Chaeto or Spaghetti Algae, is a popular macroalgae species among marine aquarists, particularly those maintaining reef tanks or refugiums. This green algae is prized for its simplicity, resilience, and utility in nutrient export, making it a functional addition to many saltwater setups. Its unbranched, filamentous structure resembles a tangled ball of green threads, which is both visually interesting and practical for aquarists.

Chaetomorpha is often used in refugiums as a natural means of controlling nitrate and phosphate levels. It grows rapidly under the right conditions, absorbing excess nutrients from the water column and thereby reducing the likelihood of nuisance algae outbreaks. Its ability to thrive in a wide range of conditions makes it a beginner-friendly choice for those looking to enhance their aquarium's water quality naturally.

Unlike some other macroalgae, Chaetomorpha does not attach to surfaces, which means it can be easily removed or relocated within the tank. This free-floating nature also makes it less invasive, as it won't overgrow corals or other tank inhabitants. Its utility and ease of care have made it a staple in the marine aquarium hobby.

Care

Chaetomorpha is incredibly easy to care for, requiring minimal attention beyond providing adequate lighting and water flow. It thrives in a variety of setups, from refugiums to display tanks, and can tolerate a wide range of water parameters. However, for optimal growth and nutrient absorption, stable water conditions and moderate to high lighting are recommended.

This macroalgae benefits from regular pruning to prevent it from becoming too dense, which can restrict water flow and reduce its efficiency in nutrient export. Pruned sections can be shared with other hobbyists or composted, making it an eco-friendly choice.

Diet and Feeding

As a photosynthetic organism, Chaetomorpha relies on light for energy. It absorbs nutrients like nitrate and phosphate directly from the water column, making it an excellent natural filter. Providing sufficient light and maintaining moderate nutrient levels in the tank will ensure its continued growth and health.

Behavior and Compatibility

Chaetomorpha is non-aggressive and poses no threat to other tank inhabitants. Its presence can even benefit certain species, such as copepods and amphipods, which use the algae as a habitat and food source. This, in turn, can support the diet of fish and invertebrates that feed on these microfauna.

It is compatible with most reef-safe fish and invertebrates, though herbivorous species like tangs and sea urchins may nibble on it. In such cases, placing the algae in a refugium or protected area can help preserve it.

Propagation

Propagating Chaetomorpha is as simple as dividing it into smaller sections. Each piece will continue to grow independently under suitable conditions. This makes it easy to share with other aquarists or expand its presence within your own system.

Health and Common Issues

Chaetomorpha is generally hardy, but its growth can slow or stop if nutrient levels drop too low or if it receives insufficient light. Yellowing or thinning strands may indicate a lack of nutrients or poor water quality. Regular monitoring and adjustments to lighting and nutrient levels can help maintain its health.

Avoid overcrowding the algae, as dense clumps can trap detritus and reduce water flow, leading to localized poor water quality. Regular pruning and occasional rinsing in tank water can prevent these issues.

Habitat

In the wild, Chaetomorpha linum is found in shallow coastal waters, often in areas with moderate water flow and abundant sunlight. It is distributed across tropical and subtropical regions worldwide, thriving in nutrient-rich environments. Replicating these conditions in captivity will ensure its success in your aquarium.

Common name: Chaeto