The Hawaiian Blue Puffer is well as a great ?personality? fish. It is sexually dimorphic, in which the males are having conspicuous point in the middle of the back, and over the position of the gill opening, which generally lacks in females and juveniles. The Hawaiian Blue Puffer produces a toxin, which is known as tetradotoxin, in the skin and viscera that makes them unpalatable to most fish. It acclimatizes quickly to an aquarium life, and needs lot of hiding places with rocks and crevices. The Hawaiian Blue Puffer is not at all considered reef safe, since it nips over the corals and can make them to suffer by darting the poison on them. It should be kept in fish only aquarium, and is highly recommended not to add multiple inhabitants in the same tank. Also, acclimation time of one to two hours should be given to this fish. It is also commonly known as Blue Spotted Sharpnose, since its brown body is covered with brilliant blue dots. The Hawaiian Blue Puffer can feed largely on red algae, green algae, and coralline algae. Since its penchant for coralline algae, the flesh of stony corals, and crustaceans, its not considered reef safe, and thus not recommended for reef aquarium. The Hawaiian Blue Puffer has a distinct feature to save itself from predation by ingesting water into the ventral portion of its body and blows up so that it becomes difficult to ingest it. It has incredibly strong plated mouth structures that are used to bite and crush even the toughest shells.