Turquoise Rainbowfish

The Turquoise Rainbowfish, also known as the Lake Kutubu Rainbowfish, is a stunning species native to Lake Kutubu in Papua New Guinea. These fish are prized for their brilliant blue-green coloration that covers most of their body, with males developing especially intense turquoise hues and deeper bodies during breeding condition. Unlike some rainbowfish that have bicolor patterns, Turquoise Rainbowfish maintain a fairly uniform but intensely saturated blue-green color that seems to glow under aquarium lighting. They have the classic rainbowfish body shape with large scales and two dorsal fins. When kept in groups in a well-maintained aquarium, they display fascinating behaviors including lateral displays and courtship rituals. Their combination of brilliant color, peaceful temperament, and interesting behaviors makes them a highly desirable species for dedicated rainbowfish enthusiasts.

Care Requirements

Tank Setup

Turquoise Rainbowfish need a spacious tank with open swimming areas and some vegetation. A 40-55 gallon tank accommodates a school of 6-8 individuals. Provide plants along the back and sides while leaving the center open for their active swimming. Use moderate filtration and ensure excellent water quality. Dark gravel or background makes their turquoise colors more striking.

Water Quality

• Temperature: 72-79°F (22-26°C)
• pH: 7.0-8.0 (prefer slightly alkaline water)
• Water Hardness: Moderate to hard, 8-20 dGH
• Ammonia/Nitrite: 0 ppm
• Nitrate: <20 ppm

Feeding

These omnivores accept a varied diet of flakes, pellets, and frozen or live foods. They benefit from vegetable matter in their diet to maintain their brilliant coloration. Supplement with color-enhancing foods and occasional treats of bloodworms or brine shrimp. Feed twice daily.

Behavior & Compatibility

Turquoise Rainbowfish are peaceful schooling fish that should be kept in groups of 6 or more. They may show mild sparring among males but this rarely results in injury. They are excellent community fish when housed with other peaceful species. Their active swimming in the upper water levels adds movement and color to any appropriately sized tank.

Tips for Success

• Keep in groups of 6+; males display best colors when competing for attention
• Their coloration improves significantly with age and proper care
• Maintain alkaline water conditions to support their natural habitat preferences
• Provide open swimming space; cramped conditions lead to stress and faded colors
• Males develop deeper bodies and more intense colors than females
• Regular water changes are essential for maintaining their brilliant turquoise appearance