Double Sea Star - Iconaster longimanus

The Double Sea Star is a visually striking invertebrate, recognized for its vibrant coloration and unique dual-arm appearance. This sea star is a peaceful addition to marine aquariums, where it grazes on detritus and contributes to the overall cleanup of the tank substrate.

Description:

Common Name: Double Sea Star, Icon Starfish

Scientific Name: Iconaster longimanus

Family: Goniasteridae

Size: Up to 6 inches (15 cm)

Temperament: Peaceful

Difficulty: Difficult

Reef Safe: Yes

Native Region:

Found in the Indo-Pacific, typically inhabiting shallow reef flats and sandy areas near coral outcroppings.

Aquarium Setup:

Tank Size: Minimum of 30 gallons

Temperature: 74–82°F (23–28°C)

pH: 8.0–8.4

Salinity: 1.023–1.025

Substrate: Sandy or rubble substrate to allow grazing; stable water conditions and moderate flow preferred.

Additional Tips:

• Behavior: Moves slowly across sand and rock surfaces, often exploring crevices and rubble.

• Tankmates: Compatible with most peaceful fish and invertebrates; avoid predatory crabs or large aggressive fish.

• Care: Little is known about its diet, though it may consume detritus and bacterial mats; ensure stable water parameters to prevent stress and tissue loss and avoid rapid changes in salinity.