Common name: Dead Man's Fingers

General Information

Codium fragile, commonly known as Dead Man's Fingers or Green Sea Fingers, is a species of green algae that has garnered attention in both natural and aquarium settings. Its unique morphology, characterized by finger-like branches, makes it a fascinating addition to marine aquariums. Native to the Pacific Ocean, it has spread to various parts of the world, often regarded as an invasive species due to its ability to outcompete native flora.

While not as popular as some other marine algae, Codium fragile offers several benefits for hobbyists. It serves as a natural water filter, absorbing excess nutrients and helping to maintain water quality. Additionally, its aesthetic appeal and ease of care make it a suitable choice for beginners and experienced aquarists alike.

Care

Codium fragile is relatively easy to care for, thriving in a range of conditions that mimic its natural habitat. It prefers stable water conditions with moderate lighting and water flow, which help it maintain its vibrant green color and healthy growth. This algae can be kept in both reef and fish-only tanks, where it provides shelter and grazing opportunities for various marine life.

Behavior and Compatibility

Codium fragile is non-toxic and safe to keep with a variety of marine species. It can coexist with fish, invertebrates, and other algae without issues. However, it may be consumed by herbivorous fish and invertebrates, so compatibility should be considered when planning an aquarium setup.

Reproduction

Codium fragile reproduces both sexually and asexually. In aquariums, it often propagates through fragmentation, where broken pieces can grow into new individuals. This characteristic makes it easy to propagate and maintain in a controlled environment.

Health and Common Issues

Codium fragile is generally hardy, but it can be susceptible to overgrowth by other algae species if nutrient levels are not controlled. Regular maintenance and monitoring of water parameters can prevent such issues. It is also important to ensure that lighting conditions are optimal to prevent browning or die-off.

Habitat

Naturally, Codium fragile is found in intertidal and subtidal zones, often attached to rocks and shells. It thrives in temperate waters with moderate wave action, which helps it maintain its structure and promotes nutrient uptake. In aquariums, replicating these conditions will support its growth and health.