Blue Linkia Starfish

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The Blue Linckia Starfish (Linckia laevigata) is a spectacular marine invertebrate recognised for its vivid electric-blue colouration and distinctive five-arm shape. One of the most striking starfish available to marine aquarists, it makes an impressive addition to mature reef aquariums.

Native to the tropical Indo-Pacific, including Australian waters and the Great Barrier Reef, Blue Linckia Starfish inhabit shallow coral reefs, reef slopes and rocky reef environments. They are commonly found moving slowly across live rock, coral rubble and other hard surfaces while grazing on naturally occurring organic material.

Blue Linckia Starfish typically have five long, cylindrical arms with rounded tips and a small central disc. Although bright blue is the best-known colour, other colour variations, including greenish-blue, orange and yellow, are also recorded in this species.

Adults can grow considerably larger than many aquarium starfish, reaching approximately 30cm across, making adequate aquarium space an important consideration.

Behaviour and Temperament

Blue Linckia Starfish are peaceful, slow-moving invertebrates that spend much of their time crawling across live rock and aquarium surfaces.

They are generally harmless towards fish, corals and other reef inhabitants and do not actively hunt healthy aquarium livestock. Their natural feeding behaviour involves grazing on biofilm, microorganisms, organic debris and other naturally occurring material found on reef surfaces.

Unlike many other aquarium invertebrates, Blue Linckia Starfish are particularly sensitive to changes in water chemistry. Sudden fluctuations in salinity, temperature or pH can cause severe stress and potentially fatal tissue deterioration.

This species is therefore best suited to experienced marine aquarists with mature, stable reef systems.

Aquarium Requirements

A large, well-established marine aquarium with extensive live rock is essential for long-term success.

Blue Linckia Starfish rely heavily on naturally occurring biofilm and microorganisms growing across mature reef surfaces. Newly established aquariums often lack sufficient natural food to sustain them, making starvation one of the major challenges associated with keeping this species.

A minimum aquarium size of approximately 400–500 litres is recommended, with larger systems providing more grazing area and greater environmental stability.

Maintain consistent salinity, temperature, pH and alkalinity. Avoid sudden changes during water changes or routine maintenance.

When introducing a Blue Linckia Starfish, careful acclimation is extremely important. Drip acclimation over several hours is generally recommended, with particular attention to matching salinity and temperature.

Important: Never expose Blue Linckia Starfish to copper-based medications. Copper is highly toxic to echinoderms and other marine invertebrates.

Feeding and Nutrition

Blue Linckia Starfish are specialised grazers that feed primarily on biofilm, bacterial films, microorganisms and organic material found on live rock and other hard surfaces.

Unlike many aquarium starfish, they can be difficult to feed directly and may not readily accept conventional prepared or frozen foods.

Their long-term survival depends heavily on having sufficient natural grazing material available throughout the aquarium.

Recommended considerations include:

• Extensive mature live rock with established biofilm.

• Naturally developing algae and microbial films.

• A mature aquarium with established biological diversity.

• Maintaining good water quality without eliminating all natural grazing surfaces.

Some specimens may investigate algae-based foods or other supplementary offerings, but acceptance should never be assumed.

Important: Do not purchase this species expecting it to survive on occasional target feeding alone. A mature aquarium with abundant natural grazing surfaces is essential.

Compatibility and Reef Suitability

Blue Linckia Starfish are generally considered reef safe and can coexist with most peaceful marine fish, corals and ornamental invertebrates.

They are not coral predators and will normally move across coral rockwork without causing damage.

However, certain aquarium inhabitants pose a significant risk. Harlequin Shrimp are specialist starfish predators, while pufferfish and some triggerfish may attack or consume starfish.

Suitable tank mates include:

• Clownfish.

• Tangs and surgeonfish.

• Anthias.

• Cardinalfish.

• Peaceful reef-safe wrasses.

• Reef-safe ornamental shrimp.

• Most established corals.

Avoid keeping them with Harlequin Shrimp, predatory starfish-eating fish and aggressive crustaceans.

Their delicate nature and specialised feeding requirements make careful stocking decisions particularly important.

Quick Care Guide

Frequently Asked Questions

1. Are Blue Linckia Starfish reef safe?

Yes. Blue Linckia Starfish are generally reef safe and will not normally damage healthy corals or bother fish. They graze on naturally occurring biofilm and organic material across reef surfaces.

2. What do Blue Linckia Starfish eat?

They primarily feed on biofilm, microorganisms, bacterial films and organic material growing on live rock. They can be difficult to feed directly, making a mature aquarium with abundant natural grazing surfaces essential.

3. How big do Blue Linckia Starfish grow?

They can reach approximately 30cm across, although larger specimens have been recorded. Their eventual size should be considered when selecting an aquarium.

4. Can Blue Linckia Starfish survive in a new aquarium?

They are not recommended for newly established aquariums. They depend on mature live rock and established microbial growth for nutrition. Introducing them into immature systems significantly increases the risk of starvation.

5. Are Blue Linckia Starfish difficult to keep?

Yes. They are considered a difficult marine invertebrate because of their specialised feeding requirements and sensitivity to changes in salinity, temperature and water chemistry. They are best suited to experienced reef keepers.

6. Can Blue Linckia Starfish regrow lost arms?

Yes. Like many starfish, Linckia laevigata has regenerative abilities and can regrow damaged or lost arms under suitable conditions. However, regeneration takes time and should not be considered a reason to deliberately damage or handle the animal roughly.

Common Mistakes

1. Adding them to immature aquariums: Young aquariums often lack sufficient biofilm and natural food. Always introduce Blue Linckia Starfish into mature, well-established reef systems.

2. Assuming they will eat prepared foods: They are specialised grazers and may not accept pellets, flakes or frozen foods. Their primary nutritional requirements must be met through natural grazing surfaces.

3. Rapid acclimation: Sudden salinity changes can cause severe osmotic stress. Use a carefully controlled, slow drip acclimation process and avoid exposing the animal to air unnecessarily.

4. Allowing salinity fluctuations: Blue Linckia Starfish are particularly sensitive to changes in specific gravity. Maintain stable salinity and avoid sudden adjustments.

5. Keeping them with natural predators: Harlequin Shrimp, certain pufferfish and triggerfish can attack or consume starfish. Check compatibility before introducing them.

6. Using copper-based medications: Copper is highly toxic to starfish. Never expose Blue Linckia Starfish to copper treatments, and ensure any medication used in the aquarium is safe for echinoderms.