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InvertebrateMarineEasy

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Chocolate Chip Starfish

Protoreaster nodosus

A large and striking tropical starfish with prominent dark horn-like nodules. Not reef-safe.

Family
Oreasteridae
Origin
Oceano Indo-Pacifico, acque tropicali poco profonde
Origin
Tropical oceans and reefs
Tank use
Used in 0 tanks

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Species challenges
Water Temperature

22 °C - 27 °C

pH Value

8.1 - 8.4

Water type

Marine

Ecological role

Predatore

Copper

Alta

Species description

Geographical Origin and Habitat: Broadly distributed in the tropical Indo-Pacific. Inhabits shallow sandy or muddy flats and seagrass beds.

Taxonomy: Member of the Oreasteridae family. Features a heavy body with five thick arms covered in dark brown, horn-like nodules.

Social Behavior: Solitary scavenger and predator. Moves slowly along the bottom searching for sessile invertebrates and food remnants.

Coloration and Sexual Dimorphism: Body ranges from cream-white to orange or brown, with dark contrasting knobs. No visible sexual dimorphism.

Care, breeding and tankmates

Tank Setup: Large FOWLR tanks (minimum 100 gallons) with plenty of open sand area and stable rock structures are best.

Diet and Feeding: Carnivorous. Must be fed directly with meaty foods like chopped shrimp, squid, or clam placed under its body.

Water Quality: Keep salinity constant at 1.022-1.026. Highly sensitive to rapid changes in water parameters.

Compatibility and Tankmates: Not reef-safe. Will eat soft corals, anemones, sponges, and clams. Keep with large, non-aggressive fish.

Aquarium Breeding: Broadcast spawning species; captive reproduction is exceptionally rare.

Risks and Diseases: Prone to melting/decay if exposed to sudden drops in salinity. Extremely sensitive to copper treatments.

Invertebrate profile

Type
Starfish
Diet
Carnivoro
Ecological role
Predatore
Minimum group
1
Adult size
30 cm
GH
n/a
KH
8 dKH - 12 dKH
TDS
n/a
Copper
Alta
Shock sensitivity
Alta
Calcium and minerals
Fornire calcio e magnesio adeguati per lo sviluppo dello scheletro calcareo.
Molting
Non muta (echinoderma), ma assorbe carbonato dal mezzo acquoso.
Reproduction
Specie a riproduzione sessuata con fecondazione esterna libera, rarissima in acquario.
Compatibility & tankmates
Non compatibile con coralli, anemoni o spugne. Coabita bene con pesci grandi e non predatori.

Image gallery

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

Related species

Other recommended species with similar care requirements and water parameters.

Last updated: 06/13/2026