The Yellowtail Blue Damsel is a beautiful fish in bright-blue color with a yellow tail that fades into clear at edges. It is absolutely a reef-associated fish that lives in sheltered lagoons and inshore coral reefs with prolific coral growth. The Yellowtail Blue Damsel is well-known for living in small groups. It is highly recommended to keep it in groups of three or else it becomes territorial. For instance, if the Yellowtail Blue Damsel is the first one to be introduced in the tank, make sure that the tank is already filled with other inhabitants or else, this fish will start acting as a territorial and would create problem for others when they are placed in the aquarium. The Yellowtail Blue Damsel is considered to be least aggressive and using them to cycle your home tanks is not recommended. The Yellowtail Blue Damsel is an omnivore and likes to consume spirulina, flake foods, and also mysis shrimps. It is completely reef safe and makes a great addition to your aquarium. In this genus, the males are generally larger and more slender and are responsible for guarding their eggs. The Yellowtail Blue Damsel can live up to 5 years in an aquarium. They are generally compatible with: Dwarf Angelfish, Large Angelfish, Anthias, Basslets, Blennies, Boxfish, Clownfish, Goatfish, Gobies, Hawkfish, Hogfish, Parrotfish, Pseudochromis, Puffers, Tangs and Surgeons and Wrasse. Caution is required with: Anglers and Frogfish, Batfish, Butterflyfish, Cardinalfish, Damselfish, Filefish, Grunts and Sweetlips, Squirrelfish and Triggerfish. They are not compatible with: Eels, Groupers, Lionfish and Scorpionfish, Seahorses and Pipefish, Sharks and Rays.