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Sargassum Shrimp

Leander tenuicornis

A small circumtropical marine shrimp famous for its incredible camouflage within floating Sargassum seaweed, featuring leaf-like appendages and mottled colors.

Taxonomy
Class:Malacostraca
Order:Decapoda
Family:Palaemonidae
Subfamily:Palaemoninae
Genus:Leander
Species:Leander tenuicornis

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Water Temperature

20 - 28 °C

pH Value

8.1 - 8.4

Water type

Marine / Brackish

Invertebrate type

Marine shrimp

Adult size

4.5 cm

Minimum group

>= 1

KH

8 - 12 dKH

Ecological role

Scavenger

Species description

Geographical Origin and Habitat: Circumtropical global distribution. Inhabits floating pelagic Sargassum seaweed in open ocean waters, but is also commonly found in seagrass beds and sheltered coastal lagoons. They are commonly found in seagrass beds and floating sargassum weed communities.
Taxonomy: Member of the family Palaemonidae. Features a slender body with an exceptionally long, flattened, and highly serrated rostrum. Develops small skin-like appendages for camouflage. Grows to 4-5 cm. Their carapace is translucent with delicate brown patterns, mimicking their plant environment.
Social Behavior: Peaceful and very active. Swims actively among algae fronds or marine vegetation. Forages constantly throughout the foliage for organic matter and small prey. They are peaceful scavengers, walking slowly over macroalgae in search of food particles.
Coloration and Sexual Dimorphism: Mottled brown, olive, or yellowish color with dark brown and white patches mimicking the air bladders and leaves of Sargassum seaweed. Females are larger with a broader rostrum than males. Females are larger than males and possess a distinct abdominal pouch for carrying eggs.

Care, breeding and tankmates

Tank Setup: Suitable for tanks of 10-12 gallons or larger. Providing a heavy growth of macroalgae (such as Caulerpa or Sargassum) or floating artificial plants is key to mimic its natural climbing habitat. Set up the aquarium with plenty of live plants or macroalgae to provide shelter and grazing sites.
Diet and Feeding: Omnivorous scavenger. Readily accepts a wide variety of foods including flake or pellet fish foods, frozen mysis, brine shrimp, and grazes on algae biofilm on vegetation. They are omnivorous detritivores that accept flakes, pellets, and frozen baby brine shrimp.
Water Quality: Tolerant of moderate salinity fluctuations (can survive in brackish environments). Requires temperature of 20-28°C and stable pH of 8.1-8.4. Sensitive to copper. Maintain correct iodine levels to assist the shrimp during their frequent molting cycles.
Compatibility and Tankmates: 100% reef-safe. Compatible with peaceful community reef fish. Do not house with large predatory fish or aggressive crabs that will treat it as a food source. Keep with peaceful nano fish and avoid large predators that might view them as food.
Aquarium Breeding: Females carry a large cluster of small eggs under their abdomen. Larvae hatch into open water and pass through planktonic zoeal stages which are difficult to rear in community tanks. Breeding can happen in tanks, where the female will release planktonic larvae after incubation.
Risks and Diseases: Low iodine levels leading to bad molts. Highly sensitive to sudden salinity drops during water changes and to any copper-based medications. Copper and standard medications must be avoided as they are highly toxic to invertebrates.

Geographic Origin and Distribution

Circumtropical global distribution. Inhabits floating pelagic Sargassum seaweed in open ocean waters, but is also commonly found in seagrass beds and sheltered coastal lagoons. They are commonly found in seagrass beds and floating sargassum weed communities.

Origin

Cosmopolitan or introducedTropical oceans and reefs

Invertebrate profile

Diet
Omnivore
As a omnivore/scavenger, Leander tenuicornis plays an active role in consuming various organic matters in its environment. Its diet in captivity should be varied, including specialized pellets, frozen foods, and natural algae or detritus depending on its specific preferences. Regular and balanced feeding is crucial for its health and longevity.
Ecological role
Scavenger
The primary ecological role of Leander tenuicornis is acting as a scavenger within the aquarium ecosystem. By constantly foraging, it helps manage waste, uneaten food, or pests, contributing significantly to water quality. Its presence introduces a natural balance and mimics complex biological interactions found in the wild.
Shock sensitivity
Medium
Leander tenuicornis is quite sensitive to sudden shifts in water parameters, particularly salinity, temperature, and pH. It is highly recommended to use a slow drip acclimation method over several hours when introducing it to a new tank. Maintaining stable conditions is vital to prevent stress-induced ailments or mortality.
Calcium and minerals
Medium
To support healthy molting and exoskeleton growth, Leander tenuicornis requires adequate calcium and trace elements like iodine in the water. Regular water changes with a high-quality salt mix usually provide sufficient levels, but specific supplementation may be necessary in heavily stocked reef tanks. Monitoring calcium and alkalinity ensures proper skeletal development.
Molting
Yes
During the molting process, Leander tenuicornis becomes extremely vulnerable to predators and aggressive tankmates. It will typically retreat to a secure hiding spot until its new exoskeleton hardens. It is important to leave the discarded molt in the tank, as the invertebrate will often consume it to reclaim valuable minerals.
Reproduction
Oviparous
Breeding Leander tenuicornis in a home aquarium is incredibly challenging due to its complex reproductive cycle. It typically involves a planktonic larval stage that requires highly specialized foods and precise water conditions to survive. In most standard setups, any spawned larvae will quickly become food for fish and corals.
Compatibility & tankmates
Peaceful
When considering tankmates, Leander tenuicornis is generally compatible with peaceful fish and other similarly sized invertebrates. Since its reef compatibility is rated as 'yes', careful observation is required if kept with delicate corals or smaller ornamental shrimp. Aggressive or large predatory fish should always be avoided to ensure its safety.

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

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Last updated: 06/30/2026
Sargassum Shrimp (Leander tenuicornis) Care Guide & Tank Setup | Atlarium