Hard Tube Coco Worm - Protula bispiralis
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The Hard Tube Coco Worm (Protula bispiralis) is a small, peaceful polychaete worm known for its striking bright orange and white feeding plumes. This invertebrate is a captivating addition to reef aquariums, adding color and natural filter-feeding behavior.
Common Name: Hard Tube Coco Worm
Scientific Name: Protula bispiralis
Family: Serpulidae
Size: Crown up to 1.5 inches (3.8 cm)
Temperament: Peaceful
Difficulty: Moderate
Reef Safe: Yes
Native Region: Found throughout the Indo-Pacific, commonly inhabiting hard substrates on coral reefs, often emerging from calcareous tubes to filter-feed plankton.
Tank Size: Minimum of 10 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate: Attach to live rock or stable hard surfaces; ensure moderate water flow to deliver planktonic food.
• Feeding: Suspension feeder—requires planktonic or finely powdered foods.
• Behavior: Typically extends feeding plumes during daylight; retracts quickly when disturbed.
• Tankmates: Compatible with most peaceful reef fish and invertebrates; avoid species that may nibble or dislodge the worm.
• Placement: Position on rock surfaces away from strong currents that may damage delicate plumes.
