- Water Conditions: Lake Kutubu Rainbowfish thrive in freshwater aquariums with a temperature range of 73°F to 82°F (23°C to 28°C). They prefer slightly acidic to neutral water with a pH level between 6.5 and 7.5. It is essential to maintain excellent water quality, regular water changes, and efficient filtration to ensure their health and well-being.

- Tank Size and Setup: Lake Kutubu Rainbowfish are active swimmers and appreciate a spacious aquarium with a minimum capacity of 30 gallons (113 liters). Provide plenty of open swimming space along with plants, rocks, and driftwood to mimic their natural habitat. Creating a visually appealing aquascape will not only please the fish but also provide them with places to explore and hide.

- Tank Mates: Lake Kutubu Rainbowfish are generally peaceful and can be kept with other peaceful community fish that share similar water requirements. They coexist well with other rainbowfish species, tetras, rasboras, and peaceful catfish like Corydoras. Avoid keeping them with aggressive or fin-nipping species to ensure a harmonious tank environment.

- Feeding Habit: Lake Kutubu Rainbowfish are omnivorous and have a varied diet. They readily accept high-quality dry flakes or pellets as their staple food. Supplement their diet with live or frozen foods such as brine shrimp, bloodworms, and daphnia to provide essential nutrients and enhance their natural colors. Offering a diverse diet ensures their optimal health and vibrant appearance.

- Care and Behavior: Lake Kutubu Rainbowfish are relatively hardy and easy to care for, making them suitable for both beginner and experienced aquarists. They are active swimmers and thrive when kept in schools of six or more individuals. Maintain stable water conditions, provide a balanced diet, and offer suitable tank mates to create a stress-free environment for their well-being.

- Breeding: Breeding Lake Kutubu Rainbowfish can be challenging but rewarding. Provide them with a separate breeding tank with dense vegetation, fine-leaved plants, and spawning mops. A slightly lower water temperature and frequent water changes may stimulate breeding behavior. The adults should be removed after spawning to prevent them from consuming the eggs. Fry can be fed with commercially available liquid fry food or finely crushed flakes.

In conclusion, Melanotaenia lacustris, the Lake Kutubu Rainbowfish, is a captivating addition to freshwater aquariums. Its vibrant colors, peaceful nature, and moderate care requirements make it a popular choice among aquarists. By providing suitable water conditions, compatible tank mates, and a varied diet, you can enjoy the beauty and graceful movements of Lake Kutubu Rainbowfish while creating a vibrant and harmonious underwater environment in your aquarium.