The Yellowtail Damselfish (Chrysiptera parasema) is a popular saltwater fish that is native to the Indian and Pacific oceans, around Japan, Australia, and the Philippines. It is a small fish that grows up to 2-3 inches in length and has an intense blue color body with a yellow tail. The Yellowtail Damselfish is known for its territorial tendencies and outspoken demeanor 3. It is a hardy fish that is suitable for aquarium owners of all skill levels. However, it can be aggressive and incompatible with clownfish and mild-mannered fish. The ideal aquarium conditions for this species are high-density coral reefs with a temperature range of high 70s to low 80s Fahrenheit, salinity of 1.025 specific gravity, pH of 8.1 – 8.4, and ammonia, nitrites, nitrates of 0 parts per million (ppm). Some popular options for feeding this fish include small meaty and vegetable-based foods.