The Electric Blue Jack Dempsey is a captivating variety of the standard Jack Dempsey Cichlid, known scientifically as Rocio octofasciata. This stunning fish has gained immense popularity in the aquarium trade for its vibrant, neon blue coloration and dynamic personality. Despite its aggressive nature, many aquarists are drawn to its beauty and the charisma it adds to a well-structured aquarium.

Overview and Appearance:
- Scientific Name: Rocio octofasciata "Electric Blue"
- Family: Cichlidae
- Size: 6-10 inches (15-25 cm)
- Lifespan: 10-15 years in optimal conditions

The Electric Blue Jack Dempsey is a sight to behold, with its bright blue body interspersed with occasional darker spots and a mix of other hues like green and purple, depending on the lighting and mood of the fish. They share the robust body shape, strong jawline, and aggressive demeanor of their standard Jack Dempsey counterparts but are slightly smaller and less aggressive.

Habitat and Tank Requirements:
Proper tank setup is essential for maintaining the health and coloration of these fish:
- Water Parameters: Neutral to slightly acidic pH (6.5-7.5), with a temperature range of 72-86°F (22-30°C).
- Tank Setup: A minimum tank size of 55 gallons for a single specimen, with additional space for tank mates. They require a habitat with plenty of hiding places using rocks, driftwood, and hardy plants. A sandy substrate is preferred to mimic their natural environment.
- Filtration: Strong filtration is needed to handle the bioload and keep the water clean and well-oxygenated.

Diet and Nutrition:
Electric Blue Jack Dempseys are omnivorous with a tendency toward a carnivorous diet:
- A diet rich in proteins including quality cichlid pellets or flakes.
- Regular feedings of live or frozen foods like bloodworms, brine shrimp, or crickets to encourage vibrant coloration and optimal health.
- Occasional vegetable matter to ensure a balanced diet and prevent digestive issues.

Behavior and Compatibility:
While less aggressive than the standard Jack Dempsey, Electric Blues can be territorial and should be housed with care:
- Suitable for a community tank with other similarly sized and temperament fish.
- Avoid housing with smaller, more docile fish that could become targets for aggression.
- Larger, robust tank mates like other cichlids or large catfish can be suitable companions, but always monitor for signs of aggression.

Breeding:
Breeding Electric Blue Jack Dempseys can be a rewarding experience. They are substrate spawners, laying their eggs on cleaned rocks or in caves. Providing a stress-free environment with plenty of hiding spaces can encourage spawning. Both parents typically show parental care, guarding and tending to the eggs and fry.

The Electric Blue Jack Dempsey is an alluring addition to any aquarium, bringing a splash of vibrant color and dynamic activity. While their care requires attention to detail, especially regarding tank setup and water quality, the visual reward and interactive behavior of these fish make the effort worthwhile. Properly cared for, the Electric Blue Jack Dempsey will thrive and become a centerpiece in the aquarium, captivating onlookers with its striking appearance and fascinating behavior. As with all aquatic life, responsible fishkeeping and an understanding of the species' needs are key to creating a harmonious and healthy underwater community.