The Male Mustard Gas Halfmoon Betta (Betta splendens) is a popular, striking aquarium fish featuring a deep blue/green-black body and vibrant yellow-to-orange fins. Known for its impressive 180-degree tail spread, it thrives in well-planted, heated () tanks. These fish are territorial and must be housed alone or with peaceful tank mates. 
Nano Tanks Australia +2
Key Characteristics & Care
Coloration: Deep, dark blue or green body with contrasting yellow or orange fins.
Tail Type: "Halfmoon" refers to a tail that spans 180 degrees, creating a semicircle.
Size: Typically 5cm to 6cm, with giant variants reaching 7cm to 9cm.
Temperament: Aggressive towards other males; should be kept in separate tanks.
Lifespan: Generally 3 to 5 years.
Tank Conditions: Requires at least 10 gallons (approx. 38 liters) with low flow, planted areas, and hiding spots.
Diet: Carnivorous; prefers high-quality pellets, frozen or live foods (brine shrimp, daphnia)