Geometric Pygmy Hawkfish

Geometric Pygmy Hawkfish (Plectranthias inermis) — Overview A tiny, patterned perchlet often mislabeled as a hawkfish, the Geometric Pygmy Hawkfish is a deep‑water Indo‑Pacific species prized for its mosaic red‑orange patterning, shy demeanor, and perch‑and‑watch behavior. Though sold as a hawkfish, it is taxonomically an anthiine perchlet, not a true hawkfish. 🐟 Identity & Appearance Scientific name: Plectranthias inermis Common names: Geometric Pygmy Hawkfish, Geometric Perchlet, Hi‑Fin Perchlet, Geometric Basslet Family: Serranidae (Anthias subfamily) Size: Typically 1.5–2 inches, occasionally up to 2–2.5 inches in aquaria. Coloration: Cream‑white base Distinct red/orange geometric blotches arranged in irregular rows Pinkish to yellow accents on fins Large greenish eyes Pattern extends onto fins and caudal peduncle Body shape: Elongated perchlet form with a high third dorsal spine and banner‑like dorsal flap. 🌍 Natural Habitat & Distribution Range: Indo‑West Pacific — Mauritius to Fiji; also Christmas Island. Depth: Typically 50–200 ft, inhabiting deep rubble zones, reef slopes, and shaded crevices. Behavior in the wild: Perches on coral branches or rubble Shy, retreating into crevices Feeds on zooplankton drifting past 🧪 Aquarium Requirements Tank size: Minimum 20 gallons; 30+ gallons preferred for stability. Aquascape: Branching rockwork or plate corals for perching Multiple hiding crevices Subdued to moderate lighting Fine mesh lid (they can dart upward) Water parameters: Temp: 72–78°F Salinity: 1.020–1.025 sg pH: 8.1–8.4 dKH: 8–12 Nitrate: <10 ppm preferred 🍤 Diet & Feeding Carnivore — zooplankton feeder. Accepts: Mysis shrimp Brine shrimp Copepods Finely chopped seafood Small carnivore pellets Baby brine or blackworms for acclimation Feeding frequency: 2–3 small meals daily; slow eater, may need target feeding. 🤝 Temperament & Compatibility General temperament: Peaceful, shy, non‑aggressive. Reef safety: Safe with corals Safe with most inverts except very small ornamental shrimp (Sexy Shrimp, Harlequin Shrimp). Fish compatibility: Good with peaceful community fish May show aggression toward small bottom dwellers (tiny gobies/blennies) of similar size.