Saltwater Fish
Helfrich's Firefish

Species Description…

Scientific Name: Nemateleotris helfrichi
Common Name: Helfrich's Firefish
Species Group: Dartfish
Habitat: Reef Safe
Care Level: Intermediate
Temperament: Peaceful
Diet Type: Carnivore
Role in Aquarium: Community Fish
Max Fish Length: 2.5 (inches)
Min Aquarium Size: 20 (gallons)
Native Range: Western and Central Pacific, including deep reefs around Tahiti and Indonesia
Nemateleotris helfrichi - Helfrich's Firefish

Nemateleotris helfrichi (Helfrich's Firefish)

Overview

  • Found in deeper reef environments of the Indo-Pacific, often near sandy slopes and rubble zones.
  • Easily recognized by its striking coloration, blending soft purples, yellows, and blues.
  • A shy and cautious species, frequently retreating to burrows when startled.
  • Often seen hovering just above the substrate, using its elongated dorsal fin to signal movement.

Feeding

  • Planktivorous, primarily consuming tiny floating organisms and copepods.
  • Readily accepts small live and frozen foods such as cyclops, mysis shrimp, and finely chopped seafood.
  • Multiple feedings throughout the day help maintain energy levels and encourage natural foraging.
  • A diet rich in marine-based proteins and supplements enhances coloration and health.

Habitat

  • Prefers low-light reef environments with sandy or rubble-based hiding spots.
  • Requires rock crevices or small caves to provide security and minimize stress.
  • Moderate water flow helps replicate natural conditions without overwhelming the fish.
  • Thrives in peaceful settings with minimal aggression from tank mates.

Fish Care

  • Optimal water temperature: 75-82°F (24-28°C).
  • pH level: 8.1-8.4, with a specific gravity of 1.023-1.026.
  • Stable water quality is essential to reduce stress and maintain long-term health.
  • Requires clean, well-filtered water with minimal fluctuations in parameters.

Compatibility

  • Extremely peaceful, making it ideal for reef aquariums with small, non-aggressive tank mates.
  • Can coexist with other firefish and gobies when housed in a well-structured environment.
  • Should not be kept with boisterous or aggressive species that may cause stress.
  • Does well in pairs or small groups if introduced properly.

Aquarium Behavior

  • Often seen hovering in the mid-water column, scanning for food.
  • Retreats quickly to its hiding spot if it senses danger.
  • Becomes more active and social in a calm, well-established aquarium.
  • Displays unique fin movements when interacting with its surroundings or tank mates.