Helfrich’s Firefish (Nemateleotris helfrichi)

Helfrich’s Firefish is one of the most striking dartfish species available for marine aquariums. Its beautiful combination of soft purple, yellow and white coloration, along with its elegant swimming style, makes it a highly sought-after addition to peaceful reef aquariums.

This species is naturally shy and spends much of its time hovering above its chosen hiding place. When startled, it quickly retreats into rockwork or a burrow. Providing plenty of rock structures and a calm environment helps the fish feel secure and display its natural behavior.

Key Information

Scientific name: Nemateleotris helfrichi

Common name: Helfrich’s Firefish

Maximum size: ~6–7 cm

Temperament: Peaceful

Reef safe: Yes

Diet: Carnivore

Difficulty: Moderate

Minimum aquarium size: ~80–100 L

Care Notes

Helfrich’s Firefish prefer peaceful aquariums with non-aggressive tank mates. A tight-fitting lid is strongly recommended, as this species is known to jump when startled.

They readily accept a variety of small frozen foods such as mysis, brine shrimp and finely chopped seafood, and will usually adapt to high-quality pellets as well.

A mature reef aquarium with stable water conditions and plenty of hiding places provides the best environment for this beautiful and delicate species.