The term "Icon Starfish" typically refers to the species Iconaster longimanus, also known as the Double Starfish or Mosaic Starfish. Here's a care guide and information about this fascinating sea star:
Physical Characteristics:
- They have five thin, tapering, and flattened arms.
- Can grow up to 30 cm (12 inches) in diameter, with a central disc around 10 cm (4 inches).
- Their most distinctive feature is a marginal row of large plates that resemble mosaic tiles, often contrasting in color with the central disc.
- Coloration can vary but often includes tan arms with symmetrically arranged dark brown bands and an orange-brown central disc. Other color variations like yellow, brown, and black are also observed.
- The "Double Star" name comes from a star-shaped pattern on their back, often in a contrasting color.
Habitat and Distribution:
- Native to the Indo-West Pacific Ocean.
- Found in deep reef areas, often where rubble collects.
- They inhabit lower reef slopes and adjacent seabed with hard bottoms, typically at depths between 5 and 200 meters (16-656 feet).
Diet and Behavior:
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Omnivores and scavengers.
- They constantly forage for micro-organisms, detritus, algae, and small benthic invertebrates.
- In an aquarium, they may also accept algae wafers or pellets and small meaty foods.
- Generally peaceful and reef-safe, not known to harm corals or other invertebrates.
- They are typically found as solitary individuals.
Aquarium Care (Considered Moderate to Difficult):
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Minimum Tank Size: A larger tank is recommended due to their potential size and foraging needs. Some sources suggest a minimum of 50 gallons, while others recommend 100 gallons or more.
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Established Tank: They require a well-established aquarium with ample live rock to provide natural food sources and hiding places.
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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 water conditions are crucial as they are intolerant of sudden changes in oxygen levels, salinity, and pH.
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Substrate: A sandy substrate is beneficial for foraging.
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Lighting: Not a critical factor, as they inhabit deeper, dimly lit areas.
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Feeding: Ensure ample live rock for natural grazing. Supplement their diet with algae wafers, pellets, or small meaty foods if insufficient algae or detritus is present. Feed on the substrate, ideally before lights out.
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Water Quality: Maintain excellent water quality through regular water changes and a good filtration system. They are sensitive to copper-based medications.
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Acclimation: Drip acclimation is highly recommended due to their sensitivity to changes in water chemistry.
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Handling: Never expose them to air during handling.
Important Considerations:
- Long-term success with Icon Starfish in aquariums can be challenging.
- They rely on consistent food availability, which might be difficult to sustain long-term in a closed system.
- Careful attention to stable water parameters is essential for their survival.
The Icon Starfish is a beautiful and unique addition to a saltwater aquarium but requires stable conditions, a mature environment, and appropriate feeding to thrive. It's best suited for intermediate to experienced reef keepers.
