Above quoted from wetwebmedia.comPseudocolchirus violaceus (Theel 1886), (Australian) Sea Apple, Violet Sea Cucumber... Eastern Indian Ocean and Western Pacific. Can be deadly toxic if disturbed... do not keep with Sea Urchins, predatory Sea Stars (e.g. Protoreastor, Asthenosoma). Sensitive to poor, changing water quality. Largely a filter feeder.