The Spotted Blue Eye Rainbowfish, scientifically known as Pseudomugil gertrudae, is a captivating and relatively small species of freshwater fish native to the slow-moving rivers, streams, and swamps of northern Australia and Papua New Guinea. This species is highly prized by aquarists for its vibrant coloration, peaceful demeanor, and active schooling behavior, making it an excellent addition to well-maintained community aquariums, especially nano tanks.

Spotted Blue Eye Rainbowfish are characterized by their slender, elongated bodies and striking coloration. Their bodies typically display a light blue or silvery base color adorned with distinctive black spots on the fins and tail. Males are usually more colorful, with more pronounced yellow and blue hues on their fins and body, and elongated fin rays that make them particularly eye-catching. Their large, expressive blue eyes add to their overall charm and give them their common name.

In captivity, Spotted Blue Eye Rainbowfish thrive in aquariums that closely mimic their natural habitat. A tank setup should include a soft, sandy substrate and plenty of live plants, such as Java moss, Anubias, and floating plants, which provide cover and create a comfortable environment. Adding driftwood and rocks can enhance the natural look of the tank and provide additional hiding spots.

Water conditions should be slightly acidic to neutral, with soft to moderately hard water. Maintaining stable water parameters through regular water changes and efficient filtration is crucial for the health and well-being of Spotted Blue Eye Rainbowfish. They are relatively hardy fish but do best in clean, well-oxygenated water with a gentle to moderate current.

Spotted Blue Eye Rainbowfish are social fish that should be kept in groups of at least six or more to promote their well-being and natural schooling behavior. Keeping them in a school not only reduces stress but also enhances their vibrant colors and active swimming patterns. They are peaceful and can be housed with other small, non-aggressive fish, making them ideal for community tanks.

Their diet should be varied to ensure they receive all necessary nutrients. Spotted Blue Eye Rainbowfish are omnivorous and will readily accept high-quality micro pellets, flake foods, and live or frozen foods such as brine shrimp, daphnia, and micro worms. Providing a mix of these foods will help maintain their health, vibrant colors, and energetic behavior.

Breeding Spotted Blue Eye Rainbowfish in captivity is relatively straightforward under the right conditions. They are egg scatterers, typically laying their eggs among fine-leaved plants or spawning mops. To encourage breeding, maintain optimal water conditions with slightly acidic, soft water and provide plenty of fine-leaved plants or spawning mops. Once spawning occurs, it is advisable to remove the adults from the breeding tank to prevent them from eating the eggs. The eggs usually hatch within a week, and the fry can be fed with infusoria or finely crushed flake food until they are large enough to accept standard fare.

Overall, the Spotted Blue Eye Rainbowfish is an excellent choice for aquarists looking for a small, colorful, and peaceful species. Their striking appearance, gentle nature, and dynamic behavior make them a delightful addition to any well-maintained aquarium. With proper care and the right environment, they can thrive and bring a touch of vibrant beauty and lively activity to your aquatic setup.