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Scientific name
Protoreaster nodosus
Family
Oreasteridae
Adult size
6-10 inches
Min tank size
75 gallons (FOWLR only)
Temperature
74-82°F
Salinity
1.022-1.026
Temperament
Peaceful but predatory toward inverts
Difficulty
Intermediate
Lifespan
7-12 years

About the Chocolate Chip Sea Star

Chocolate chip sea stars are striking carnivorous stars with raised brown bumps that look like chocolate chips on a tan body. NOT reef safe - they will eat corals, clams, snails, and other inverts. Suitable only for FOWLR or fish-only systems with hardy cleanup crew. Easy to keep with appropriate setup; one of the most commonly available marine stars.

Native range: Indo-Pacific. Most US trade specimens come through marine wholesale suppliers in Indonesia, the Philippines, Hawaii, and the Caribbean. Wild collection remains the primary sourcing method for the majority of marine inverts - few are captive-bred at commercial scale. Quality of acclimation at the wholesale/retail stage is the biggest single predictor of long-term survival in home aquaria.

Tank setup and parameters

Tank size: 75 gallons (FOWLR only). Parameters: temperature 74-82°F, salinity 1.022-1.026, plus the standard reef tank requirements - stable calcium 420-440 ppm, alkalinity 8-10 dKH, magnesium 1300-1400 ppm, nitrate under 25 ppm, phosphate under 0.05 ppm. The species requires conditions consistent with a healthy reef tank rather than nutrient-stripped sterile water - well-established systems with diverse microfauna and biofilm typically support these inverts better than newly-cycled tanks.

Lighting: depends on species. Photosynthetic inverts (clams, anemone-symbiotic species) require high-PAR reef LED lighting. Filter-feeders (worms, scallops) prefer moderate lighting and benefit from particulate-rich water. Flow: moderate, indirect flow works for most inverts - direct high-velocity flow stresses or damages soft-bodied species.

Acclimation: drip acclimate over 2-4 hours for hardy species, 4-8 hours for sensitive species (Linckia stars, sea hares, demanding nudibranchs). Never expose inverts to air during transfer - capture in a bowl underwater and transfer wet.

Diet and feeding

Chocolate Chip Sea Star diet: Carnivore - meaty foods, dead fish, shrimp, snails, small inverts. Feeding strategy depends on dietary type. Algae eaters require established tanks with biofilm and microalgae growth - new tanks lack the algal base they need. Carnivore inverts (starfish, some snails) need targeted meaty feedings 2-3x weekly. Filter feeders (clams, worms, scallops) need phytoplankton in the water column. Photosynthetic species need adequate lighting plus supplemental amino acid or coral food dosing.

Compatible tank mates

Safe: Fish 3"+ that ignore the star; large hermit crabs (some species).

Avoid: Corals, clams, small snails, small shrimp - all are food.

Breeding

Not captive bred typically.

Common problems and solutions

Cleanup crew predation; not reef safe (frequently misrepresented as such); requires varied carnivore diet.

Keeper note: Strictly FOWLR - will eat soft corals, LPS, clams, snails over time. Target-feed with meaty foods 2-3x weekly to reduce predation pressure on cleanup crew.

Frequently asked questions

Are chocolate chip sea stars reef safe?

No - they eat corals, clams, and most small inverts. Strictly FOWLR or fish-only.

How often should I feed a chocolate chip star?

2-3 times per week with meaty foods (chopped shrimp, fish, mussel). Reduces predation on tank inhabitants.

How big do chocolate chip sea stars get?

6-10 inches across at adult size.

How much do chocolate chip sea stars cost?

$15-40 each.

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