Helfrichi Fire Fish Goby

The Helfrichi Firefish Goby (Nemateleotris helfrichi) is a rare, deep‑water dartfish prized for its purple‑yellow coloration, peaceful temperament, and need for a calm, stable reef environment. It is more delicate than other firefish species and requires careful acclimation and a secure, low‑stress setup. 🐠 Species Identity • Scientific name: Nemateleotris helfrichi • Common names: Helfrichi Firefish, Helfrich’s Dartfish, Lavender Firefish • Adult size: 2.5–3.5 inches (sources list 3–3.5" on average) • Care level: Moderate to Intermediate — more delicate than N. magnifica or N. decora 🎨 Appearance • Coloration: • Lavender‑to‑purple body • Golden‑yellow face • Blue, pink, and mauve accents on fins • Distinctive features: • Long, elegant first dorsal spine • Slender, hovering swimming style • Why it’s prized: Considered the “crown jewel” of dartfish due to its deep‑water coloration and rarity 🌍 Natural Habitat • Range: Central & Western Pacific — Marshall Islands, Palau, Fiji, Samoa • Depth: 25–90 meters — significantly deeper than other firefish species • Environment: • Outer reef slopes and drop‑offs • Hovers above burrows; darts into crevices when threatened 🧠 Behavior & Temperament • Temperament: Very peaceful, shy, easily intimidated • Reef‑safe: Yes — completely safe with corals and inverts • Social structure: • Can be kept singly or as a bonded pair • Pairs coexist peacefully in appropriate space • Jumping risk: Extremely high — a tight‑fitting lid is mandatory 🏡 Aquarium Requirements • Minimum tank size: 20 gallons (10–20 gal for nano setups; 20+ preferred for stability) • Aquascape: • Plenty of live rock for caves and crevices • Moderate flow • Subdued or gradually acclimated lighting (deep‑water species) • Water parameters: • Temp: 72–79°F • pH: 8.1–8.4 • Salinity: 1.020–1.025 SG 🍽️ Diet • Type: Planktivorous carnivore • Wild diet: Zooplankton drifting in the water column • Captive diet: • Frozen mysis shrimp • Enriched brine shrimp • Cyclops • Finely chopped meaty foods • High‑quality micro‑pellets once settled • Feeding frequency: Multiple small feedings daily due to high metabolism 🧬 Hardiness & Lifespan • Lifespan: 3–5+ years with proper care • Hardiness: • Adapts well once acclimated • Sensitive to aggressive tankmates and sudden lighting changes • Captive‑bred availability: Yes — captive‑bred individuals exist and acclimate more easily 🪸 Compatibility • Good tankmates: • Peaceful nano fish (chromis, small wrasses, gobies) • Other gentle community reef species • Avoid: • Aggressive or boisterous fish • Large wrasses, dottybacks, hawkfish • Predatory shrimp or crabs