Marble Shrimp

Geographical Origin and Habitat: Widely distributed in the tropical Indo-Pacific, from the Red Sea and East Africa to Hawaii and French Polynesia. Inhabits shallow coral reefs, rubble beds, and lagoons.

Taxonomy: Member of the family Hippolytidae. Features a robust body with a rigid exoskeleton, spiny legs, and dorsal tufts of setae (hair-like structures) enhancing camouflage. Reaches 5-6 cm.

Social Behavior: Mainly nocturnal and light-avoiding. Spends daylight hours hidden deep under rocks or inside reef crevices, becoming active under cover of darkness to forage.

Coloration and Sexual Dimorphism: Marbled coloration in shades of brown, green, and grey during the day; shifts to a bright reddish-orange hue at night. Adult males develop exceptionally long first walking legs with claws.

Tank Setup: Requires a tank of at least 15-20 gallons provided with plenty of live rock, dark caves, and shaded crevices where the shrimp can hide during the day.

Diet and Feeding: Opportunistic omnivore. Feeds on detritus, leftover fish food, algae, and small benthic organisms. Accepts frozen mysis, brine shrimp, chopped krill, and sinking pellets.

Water Quality: Standard reef parameters. Salinity SG 1.020-1.025, pH 8.1-8.4, temperature 22-28°C. Very sensitive to chemical changes. Copper must be strictly avoided.

Compatibility and Tankmates: Not 100% reef-safe. May nip at small coral polyps (SPS and LPS), zoanthids, or small feather dusters if underfed. Otherwise compatible with peaceful reef fish.

Aquarium Breeding: Females carry eggs under their abdomen. The larval stages are pelagic and complex, and do not survive standard home aquarium filtration systems.

Risks and Diseases: Low iodine or calcium leading to failed molts or lost limbs. Vulnerable to predation right after shedding its exoskeleton when its body is soft.