Blue Ring Octopus
A deadly pet. DANGER!! The beautiful Blue Ringed Octopus - Hapalochlaena spp. - is not recommended as an inhabitant for any reef tank. Their venomous bite can cause paralysis (and asphyxiation) within mere minutes, and the animal should not be handled. If one is going to be kept, a purpose built tank with a well-sealed weighted lid is a must to keep this creature from escaping - a recommendation for all octopus, venomous or not. They are not intentionally aggressive toward humans, still care must be taken to avoid being bitten. This cephalopod is a predator of small fish and various crustaceans, and should be in a species tank. Not reef-safe.