Yellowtail Blue Damselfish The Yellowtail Blue Damselfish (Chrysiptera parasema), also known as the Yellow Tail Blue Damsel, hails from the Indo-Pacific region, favoring coral-rich habitats and displaying a bright blue body with a neon yellow tail. Reef safe and adaptable to reef aquariums, they thrive in groups of three or more but can become territorial if not introduced last into the tank. With a lifespan of up to five years, they're hardy omnivores, accepting a varied diet. Tank requirements include a minimum size of 30 gallons, stable water parameters, and moderate water flow. A minimum tank size of 30 gallons is suitable for a single Yellowtail Blue Damselfish, and adding 10 gallons for each additional fish is recommended. Stable water parameters, including a pH of 8.1-8.4, salinity between 1.020 and 1.025, and a water temperature of 74°F to 78°F, are crucial. Moderate water flow mimics their natural habitat. Their vibrant coloration intensifies from juvenile to adult stages, making them visually striking additions to well-lit aquariums. Compatible tank mates include Banggai Cardinalfish, Fire Goby, Green Chromis, Yellow Clown Goby, and Royal Gramma. Purchasing from Saltwaterfish.com ensures acclimated and sustainably sourced specimens, contributing to both the aquarium's success and marine ecosystem conservation efforts Habitat and Natural Environment: Originating from the Indo-Pacific, Yellowtail Blue Damselfish thrive in coral-rich areas within sheltered spots of coral reefs. Reef Compatibility and Behavior: Reef safe, they adapt well but can be territorial, especially during breeding. Providing hiding spaces and a balanced fish mix can mitigate aggression. Size, Lifespan, and Sexual Dimorphism: Petite, averaging 3 inches, with minimal sexual dimorphism and a lifespan of up to 5 years under proper care. Diet in Captivity: As omnivores, the Yellowtail Blue Damselfish will accept marine pellets, flakes, and frozen foods like brine shrimp, ensuring a diverse diet for health and vibrancy. Aquaculture and Availability: Prioritizing sustainability, Saltwaterfish.com offers aquacultured specimens when available, contributing to conservation efforts. Wild-caught specimens are sustainably collected. Tank Requirements: Optimal conditions include a minimum 20-gallon tank for one fish, adding 10 gallons per additional fish. Stable pH (8.1-8.4), salinity (1.020-1.025), and temperature (74-78°F) are crucial, with moderate water flow. Juvenile to Adult Coloration Changes: Juveniles display a vibrant yellow tail intensifying with maturity, complementing a striking blue and yellow body in well-lit aquariums. Common Names: Also known as Yellowtail Damsel, Blue Damselfish, and Yellowtail Demoiselle. Compatible Tank Mates: Banggai Cardinalfish (Pterapogon kauderni), Fire Goby (Nemateleotris magnifica), Green Chromis (Chromis viridis), Yellow Clown Goby (Gobiodon okinawae), Royal Gramma (Gramma loreto) Notes for New Hobbyists: The Yellowtail Blue Damselfish should be introduced after establishing a stable tank. Make sure to provide hiding spaces and regular water testing. .