Codium Algae

Codium is a distinctive green macroalgae that can make an excellent addition to marine and reef aquariums. Often recognised by its soft, velvety appearance and branching growth, Codium brings a natural, established look to an aquarium while providing additional structure and habitat for small marine organisms.

Its deep green colour provides a strong contrast against live rock, sand and colourful corals. Codium can be used as part of a natural reef aquascape or grown in a dedicated macroalgae area or refugium.

Why Keep Codium?

Codium is more than an attractive addition to the aquarium. As it grows, it takes up nutrients from the surrounding water, helping to compete with unwanted algae and contributing to nutrient export within a naturally managed marine system.

Its branching structure also increases the complexity of the aquarium environment, creating additional surfaces and sheltered areas that can be utilised by microorganisms and small invertebrates.

Key Features

• Attractive deep green marine macroalgae

• Distinctive soft, branching growth

• Adds natural colour and texture to reef aquariums

• Utilises nutrients as it grows

• Provides additional surface area and habitat

• Suitable for marine and reef aquariums

• Can be grown in a refugium or display aquarium

• Excellent for natural-looking aquascapes

Care Requirements

Codium is best maintained in stable marine aquarium conditions with suitable lighting and consistent water movement.

Moderate lighting and good circulation will help support healthy growth. Avoid placing Codium in areas where it is likely to become buried in sand or covered by detritus, as good water movement around the algae is important.

Codium benefits from having measurable nutrients available within the aquarium. Extremely low nitrate and phosphate levels can limit macroalgae growth, so avoid stripping the aquarium of nutrients if the aim is to maintain healthy macroalgae.

Monitor the algae regularly and remove or trim excess growth when necessary. Harvesting excess macroalgae can help physically export nutrients from the aquarium.

Adding Natural Complexity to Your Reef

A marine aquarium does not have to be made up solely of rock and coral. Macroalgae such as Codium can introduce additional structure, texture and habitat while creating a more natural-looking environment.

Its deep green colour and unusual growth form make Codium an excellent choice for hobbyists looking to add something different to their reef aquarium, whether used as part of the main aquascape or grown within a dedicated macroalgae area.