ranges of all females within the group. Females are only aggressive towards lower-ranking members of their own group, in order to maintain their current rank. In captivity C. bicolor have been observed to act as facultative cleaner fish. It seems unlikely that they show this behaviour in the wild. In aquaculture Because bicolor angelfish are classified as aggressive fish, they require a larger tank size, at least 75 gallons. They do not survive well in captivity and are not well suited for a reef aquarium. They are best suited for a tank consisting of coral, rocks and plants. Tanks with the most hiding spaces are best, as they like to move from one hiding place to another. The best water temperature for fish in captivity is typically between 72-78F. An optimal pH level is between 8.1 and 8.4. The level of care these fish require is moderate. These fish will survive best if there are no other fish species present within the same tank. It is recommended that bicolor angelfish in captivity be fed algae, shrimps, worms, and spirulina flakes. References External links Bicolor Angelfish at Centropyge.net Bicolor Angelfish at Fishlore.com Bicolor angelfish Articles containing video clips Fish described in 1787