Matano Rainbowfish

Scientific Name: Telmatherina antoniae
Common Names: Antonia’s Sailfin Silverside, Matano Rainbowfish
Family: Telmatherinidae
Origin: Indonesia (Lake Matano, Sulawesi; clear, deep lake waters)
Size: 2.8–3.3 inches (7–8.5 cm); males slightly larger with more vibrant colors
Lifespan: 3–5 years with proper care

Blue Morph: Vibrant blue body with iridescent highlights, often shimmering under light. The fins, especially the elongated dorsal and anal fins, may show blue or greenish hues with faint black edging.
Yellow Morph: Bright yellow to golden body, sometimes with a slight greenish tint. The fins display similar elongation with yellow or orange tones, occasionally with black or transparent margins.

Behavior: Peaceful, active, and schooling. Thrives in groups of 6–12 to promote natural schooling behavior and reduce stress. Males display vibrant blue or yellow morphs and engage in courtship displays, while females are less colorful.

Temperature: 75–82°F (24–28°C); avoid prolonged exposure above 84°F.
pH: 7.0–8.0 (neutral to slightly alkaline).
Water Hardness: 8–15 dGH
Nitrate Levels: Below 20 mg/L
Water Flow: Gentle to moderate, mimicking lake conditions
Oxygenation: High, with good surface agitation to ensure adequate oxygen
Maintenance: Weekly 20–25% water changes with a quality filter (e.g., canister or hang-on-back) to maintain pristine water quality, as this species is sensitive to ammonia and nitrates.

Compatible with peaceful nano fish like small rasboras, tetras, or other rainbowfish (e.g., Telmatherina bonti). Avoid aggressive fish or egg-eating species like Telmatherina sarasinorum, which preys on T. antoniae eggs. Safe with larger shrimp (e.g., Amano Shrimp) in planted tanks, though shrimplets may be eaten.