🐠 Helfrich's Firefish (Nemateleotris helfrichi)
A Yellow Head Fading Into Purple, Then Pearly White • The Smallest of the Three Nemateleotris Firefish • A Determined Jumper Needing a Secure Lid
 
📋 Helfrich's Firefish, also known as Helfrich's Dartfish, has a gorgeous gradient body, a bright yellow head fading into a rich purple, then softening into a pearly white toward the tail.
It comes from deeper Indo-Pacific reef slopes, particularly around the Marshall Islands and French Polynesia, the smallest of the three Nemateleotris firefish and hailing from somewhat deeper water than the common Fire Dartfish, making it a touch more delicate and better suited to a mature, stable tank. Every Helfrich's Firefish we ship is feeding well.
Like its relatives, this species is an enthusiastic jumper, and a secure lid is essential, even leaving the acclimation bag open a moment too long can be enough for it to launch itself out. It's also worth knowing that two unpaired individuals will fight, so only house more than one as a confirmed bonded pair, and since sexing this species is very difficult, obtaining a group of juveniles and letting them pair off naturally is the most reliable approach. It's fully reef safe and won't harm corals or invertebrates. It reaches up to 7.6cm, so a 75L tank suits it well.
 
💡 Highlights
🎨 Yellow-Purple-White Gradient: One of the most beautiful small reef fish
⚠️ A Jumping Risk: A secure lid is essential for this species
🌿 Fully Reef Safe: Won't harm corals or invertebrates
📏 A Nano Species: The smallest of the three Nemateleotris firefish
🧠 Difficult to Sex: Best paired by letting juveniles form bonds naturally