Crosshatch Triggerfish (Xanthichthys mento)

 

• Small fish safe: ✅ Yes (one of the most peaceful triggerfish)

• Small invert safe: ⚠️ With caution (generally safe, but may eat small shrimp)

• Coral safe: ✅ Yes (one of the few truly reef-safe triggerfish)

• Minimum tank size: 680 liters (180 gallons) for juveniles, 950+ liters (250+ gallons) for adults

• Adult size: Up to 30 cm (12 inches)

• Diet: Carnivorous, feeding on zooplankton and small invertebrates

• Be aware of: One of the most peaceful triggerfish; requires ample open swimming space; can be shy when first introduced

 

Appearance and Coloration

The Crosshatch Triggerfish is one of the most visually stunning and reef-safe trigger species. Its body is covered in a beautiful crosshatch pattern of yellow and blue lines, giving it a net-like appearance. Males tend to have more vibrant colors, with a deep red or orange tail, while females display a more subdued yellowish hue. Both sexes have bright blue markings on the face and fins, adding to their overall striking appearance.

 

Natural Habitat and Behaviour

Native to the Central Pacific, Xanthichthys mento inhabits deep reefs and outer reef slopes at depths ranging from 30 to 150 meters (100 to 500 feet). Unlike more aggressive, bottom-dwelling triggers, the Crosshatch Triggerfish is a planktivore, meaning it prefers to swim in the water column rather than stay near the substrate.

This species is one of the most peaceful triggerfish, making it an excellent choice for large reef tanks. However, due to its natural deep-water habitat, it may take time to adjust to brighter lighting and can be shy when first introduced.

 

Tank Requirements and Water Parameters

• Minimum Tank Size: 180 gallons (680 liters) for juveniles, 250+ gallons (950+ liters) for adults

• Water Parameters:

• Temperature: 24°C – 27°C (75°F – 81°F)

• pH: 8.1 – 8.4

• Specific Gravity: 1.020 – 1.025

• Aquascaping:

• Open swimming areas are essential, as this species spends most of its time in the water column.

• Caves and ledges provide shelter for resting.

• Stable rockwork is recommended, though this species is less likely to rearrange the tank than other triggers.

• Lighting: Moderate (deep-water fish may take time to adjust to intense reef lighting).

• Water Movement: Moderate to strong, mimicking deep-reef currents.

 

Diet and Feeding

Unlike many other triggerfish, the Crosshatch Triggerfish is primarily a planktivore, meaning it does not actively hunt crustaceans on the reef. This makes it one of the safest triggers for a reef environment.

• Natural Diet: Zooplankton, small crustaceans, and floating invertebrates.

• Captive Diet:

• Mysis and brine shrimp.

• Chopped seafood (shrimp, squid, clams).

• High-quality marine pellets and flakes.

• Occasional algae-based foods to ensure a balanced diet.

Feeding Frequency: 1-2 times per day to maintain energy levels and coloration.

 

Compatibility and Social Structure

• Temperament:

• One of the most peaceful triggerfish, making it a good choice for large community tanks.

• Generally does not display territorial aggression, even toward other triggers.

• Tank Mates:

• Compatible with other large, peaceful fish, such as:

• Tangs

• Large angelfish

• Butterflyfish

• Wrasses

• Can be kept in pairs or small groups in very large aquariums (300+ gallons).

• Avoid highly aggressive triggers, which may outcompete or stress them.

• Reef Compatibility: ✅ One of the few reef-safe triggerfish—does not damage corals but may eat small shrimp.

Important Considerations

• Best for Large Reef Tanks: Unlike most triggerfish, this species does not harm corals, making it one of the few reef-safe triggers.

• Can Be Shy at First: May take time to adjust to brighter lighting and active tank mates.

• Open Water Swimmer: Prefers to stay in the mid to upper water column, so provide plenty of open space.

• Less Likely to Rearrange Rockwork: Unlike more aggressive triggers, this species does not dig or move decorations.