The Rhinogobius zhoui, also known as Zhou's Goby, is a fascinating freshwater fish species belonging to the Gobiidae family. Endemic to China, specifically in the upper Yangtze River drainage, these gobies are known for their vibrant colors and intricate behaviors. Here are the key features and care requirements for Rhinogobius zhoui:

Key Features:

• Coloration: Zhou's Goby exhibits a beautiful combination of colors, including shades of blue, yellow, and orange. Males, in particular, often display more vibrant and striking colors.
• Size: Adult Zhou's Gobies typically reach a size of around 2 to 3 inches (5 to 7.5 centimeters).

Water Conditions:

• Temperature: Maintain a subtropical to tropical environment with temperatures between 64°F to 75°F (18°C to 24°C).
• pH Levels: Aim for slightly acidic to neutral water conditions, ideally between 6.5 to 7.5.
• Water Hardness: Keep water hardness in the soft to medium range, around 5 to 15 dGH.

Tank Setup:

• Aquarium Size: A tank of at least 20 gallons is recommended for a small group of Zhou's Gobies.
• Substrate: Use sand or fine gravel substrate to mimic their natural habitat. These gobies may sift through the substrate in search of food.
• Decoration: Provide hiding spots with rocks, caves, and driftwood. Live plants can also be included, but make sure they don't impede the fish's movement.

Tank Mates:

• Zhou's Gobies are generally peaceful but can be territorial, especially during breeding.
• Suitable tank mates include other peaceful species that can tolerate their territorial behavior.

Feeding Habits:

• Zhou's Gobies are omnivores. Offer a varied diet that includes high-quality flakes, pellets, and supplement with live or frozen foods such as brine shrimp, daphnia, and bloodworms.

Care and Maintenance:

• Regular water changes are crucial to maintain water quality.
• Ensure proper filtration and moderate water movement.

Behavior:

• Zhou's Gobies are known for their interesting behaviors, including territorial displays and courtship rituals.
• They are generally bottom-dwelling fish and may spend time sifting through the substrate.

Breeding Behavior:

• Breeding Zhou's Gobies in captivity may require specific conditions, including suitable hiding spots and proper water parameters.