Red Tooth Trigger XL

Red Tooth Trigger XL (Odonus niger)

Appearance & Behavior

Blue to purple coloration, flowing tail extensions, and red teeth in larger individuals distinguish this active open-water trigger. Also known as the Niger Triggerfish. Triggerfish are alert, inquisitive swimmers that use a locking dorsal spine to brace inside shelter. Individual behavior varies, and an apparently peaceful juvenile may become more assertive with age.

Quick Care Guide

• Care level: moderate; established marine housing and careful stocking required.
• Temperament: semi-aggressive, potentially aggressive with maturity.
• Adult size: up to approximately 20 inches.
• Minimum aquarium: 180 gallons as an adult baseline; a long, wide footprint is essential, and very large adults may need substantially larger housing.
• Diet: planktivorous carnivore.
• Reef compatibility: with caution; coral compatibility does not guarantee invertebrate safety.
• Temperature: 72–78°F.
• Specific gravity: approximately 1.023–1.025.
• pH: 8.1–8.4.
• Alkalinity: 8–12 dKH; maintain stable conditions suited to all inhabitants.

Aquarium Setup & Compatibility

Provide a mature, fully cycled marine aquarium with broad swimming lanes, strong filtration, good oxygenation, and secure rock caves large enough for the adult fish. Stabilize rockwork so digging or moving decorations cannot cause a collapse. Protect accessible equipment, cords, and vulnerable tubing from biting. Use a secure lid and leave enough turning space around shelter.

Choose robust, appropriately sized companions without crowding. Avoid tiny fish, vulnerable long-finned species, and tankmates that cannot compete safely for food. Avoid mixing with lionfish, whose fins may be bitten. Mixing triggerfish is not a routine community recommendation; keep a workable separation plan and respond promptly to persistent chasing or injuries.

Reef & Invertebrate Compatibility

Some individuals coexist with corals, but behavior is not guaranteed. They may pick at sessile animals or disturb unsecured frags. Shrimp, crabs, snails, urchins, and other small invertebrates may be attacked or eaten. Even cleaner animals are not guaranteed protection. Secure corals and observe livestock closely after introduction.

Feeding

Offer suitably sized frozen mysis, marine zooplankton preparations, chopped shrimp, clam, squid, and quality marine carnivore pellets. These open-water feeders need appropriately sized foods they can take readily, not just large hard-shelled items.

Feed controlled portions once or twice daily, with additional small meals for growing juveniles when needed. Confirm that the fish actually swallows food and maintain good body condition without overfeeding. Avoid a krill-only diet, freshwater feeder fish, and mammal or poultry meat. Remove uneaten food promptly and account for the substantial waste produced by larger individuals.

Introduction & Long-Term Care

Quarantine new fish when possible, establish reliable feeding, and acclimate to temperature and salinity before introduction. Provide a quiet sheltered area during adjustment and monitor access to food. Inspect breathing, fins, skin, and body condition daily and seek experienced aquatic-veterinary guidance for persistent food refusal, lesions, or abnormal breathing.

Keep hands clear of the mouth, never hand-feed, and use appropriate tools during maintenance. Triggerfish can inflict serious bites. Do not pull a fish from a crevice or force down its locking spine. Arrange safe transfers without entangling the fish, and reassess housing and compatibility as it grows. Small purchase size is not a substitute for a permanent adult care plan.