The term "blue sea starfish" most commonly refers to the species Linckia laevigata, also known as the Blue Linckia, Blue Starfish, or Comet Sea Star. Here's a guide to their care and some interesting facts:
Habitat and Distribution:
- Native to the Indo-Pacific region, found in warm, tropical waters.
- Commonly found on coral reefs, sandy bottoms, and seagrass beds.
- They live in shallow waters, typically between 1 and 30 meters (3 to 100 feet) deep.
- They can attach themselves to rocks, corals, or other hard surfaces.
Physical Characteristics:
- They are known for their vibrant blue coloration, which can sometimes have red or purple spots.
- Typically have five arms, but variations with four or more arms can occur.
- Can grow to a size of 12 inches (30 cm) or even up to 16 inches (40 cm) in diameter.
- They have a hard body.
Diet and Behaviour:
- Primarily detritivores, feeding on decaying organic matter, algae, and small microorganisms.
- They are slow-moving and constantly forage for food.
- Generally solitary but can be peaceful with other starfish and compatible tank mates.
- They are nocturnal feeders, often coming out at night.
Aquarium Care (Considered "Expert Only"):
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Large Tank: Minimum 40 gallons (150 litres), but larger is better due to their size and foraging needs.
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Established Tank: They require a well-established tank with a stable environment (at least 6 months to a year old).
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Water Parameters:
- Temperature: 72-78°F (22-26°C)
- Salinity: 1.023-1.025
- pH: 8.1-8.4
- dKH: 8-12
- Stable conditions are crucial as they are very sensitive to changes.
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Substrate: Sandy or coral rubble substrate with plenty of live rock for foraging and hiding.
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Lighting: Well-lit tank to encourage algae growth.
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Diet: They primarily graze on algae and microorganisms on live rock. Supplementation with small pieces of clam meat or feeding tablets placed under the starfish may be necessary, especially in newer tanks.
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Water Quality: Excellent water quality is essential. They are sensitive to contaminants and copper-based medications.
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Acclimation: Drip acclimation is strongly recommended due to their sensitivity to changes in water chemistry.
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Handling: Should never be exposed to air during handling.
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Tank Mates: Peaceful tank mates are necessary. Avoid aggressive fish or invertebrates.
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Regeneration: While they can regenerate limbs in the wild, it's less common in home aquariums.
Interesting Facts:
- They use a water vascular system to pump nutrients throughout their bodies.
- They move using tiny tube feet on their undersides.
- They lack a brain but have a nervous system.
- They can live for 5-10 years in a well-maintained aquarium, and up to 10 years in the wild.
- They can regenerate lost arms.
- They play a role in the ecosystem by feeding on detritus and small invertebrates, helping to keep their environment clean.
