Celebes Rainbowfish

Species Profile

• Scientific Name: Marosatherina ladigesi
• Common Name: Celebes Rainbowfish
• Adult Size: 2.5–3 inches (6–7.5 cm)
• Life Expectancy: 3–5 years
• Habitat: Native to the freshwater and slightly brackish streams, rivers, and estuaries of Sulawesi (formerly Celebes), Indonesia. Found in clear, slow-moving waters with dense vegetation and good light penetration

Tank Requirements

• Minimum Tank Size: 20 gallons (75 liters) for a small school; larger recommended for stability and activity
• Ideal Temperature: 72–82°F (22–28°C)
• pH Range: 7.0–8.0
• Water Hardness: 10–20 dGH (moderate to hard water)
• Temperament: Peaceful and social; best kept in groups of 6 or more. Compatible with other small, non-aggressive fish

Diet & Nutrition

• Omnivorous: Yes
• Diet: Accepts high-quality flakes, micro pellets, and live/frozen foods such as daphnia, brine shrimp, and mosquito larvae. A varied diet enhances coloration and vitality

Appearance

• Coloration: Slender, translucent body with iridescent silver-blue sheen. Males often display yellow, blue, and black markings on the fins
• Body Shape: Streamlined and elongated, built for quick swimming
• Fins: Long, trailing dorsal and anal fins in males, often with striking color highlights

Distinctive Features

• Unique fin extensions in males, especially on the second dorsal and anal fins
• Subtle but striking coloration, enhanced under strong lighting
• Prefers planted tanks with open swimming space and gentle filtration
• Sensitive to water quality — requires stable, clean conditions with minimal fluctuations