Again, don't attempt to memorize anything. Just enjoy the diversity. These fish often swim in schools in deeper water off the reef upper slope where they hunt for smaller reef fish. Scientists have had a tough time figuring out what has lead to the high diversity of reef butterflyfishes. It is one of a few kinds of reef fish that can change sex as an adult.
Females live in a harem with a male.
Within the group of females, there is a dominant female. When the male dies or leaves, the dominant female is capable of turning into a male. The oviducts and ovaries change into testicles. That way, mating can always take place. Algae are single-celled or colonial organisms that photosynthesize to make their own food.