A read from Wet Web media:
Ostraciidae, from the Greek ostracum, meaning "shell", the box, trunk or cowfishes are found all over the tropical Atlantic, Indian and Pacific oceans. Fourteen genera with about thirty three species. These may be the most characteristic of fishes with their bodies encased in a bony carapace.
The family is also notable for some members possession of "ostracitoxin" a toxic discharge substance of some trunkfishes. If/when sufficiently disturbed whole tanks, and recirculating systems of livestock have been wiped out. Though this is rare, the cautions listed elsewhere in this piece on netting, acclimation, and tankmates should be heeded if you intend to try a trunk/boxfish.
The genus Lactoria, especially Lactoria cornuta should be dealt with carefully; I have witnessed three poisoning "episodes" with this species, one from a dead specimen in a filter, another from a harassed individual, the third from the careless introduction of shipping water into a display system.
Lactoria and members of the genus Lactophrys are commonly called Cowfishes for their "horns", a conspicuous pair on the head and another doing rear-guard near the anal fin. The Smooth Trunkfish, Lactophrys triqueter is the most frequently offered member of the genus, with the Scrawled (Lactophrys quadricornis) and Honeycomb (Lactophrys polygonius) cowfishes occasionally available. All three hale from the western tropical Atlantic and grow to at least eleven inches in length.
Did he get harrassed A?