1, with different forms. The eight-headed coral is round and has deep grooves on its surface, which looks like a human brain. Kainao, also called cat's eye coral, is oval. This coral consists of rows of neatly arranged tentacles on both sides of the coral, and its mouth is very long at the bottom, shaped like a groove.
2. Different colors. The color of the eight-character brain coral is monotonous, and there is no variety of color matching, while the color of the brain is diverse and colorful.