The Yellowfin Blue Devil Damsel, Chrysiptera flavipinnis, is a bright blue damselfish with a yellow edge around its body and yellow fins. The Yellowfin Blue Devil Damsel is aggressive and should not be paired with fish of its own species, or smaller passive fish. They will eat most meaty frozen foods as well as flake foods. They should be kept in a minumum tank size of 30 gallons and they can reach up to 3 inches in length. This hardy fish is a strong candidate for a beginner tank.